Document the Course Assignments and implementations

Author: subhatav

README.md

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-# design-patterns
+* ### Information Credits: [`refactoring.guru`](https://refactoring.guru/design-patterns)
+* ### Documentation Credits: [`java-design-patterns`](https://java-design-patterns.com/patterns/)
+* ### Video Credits: [`@ConceptAndCoding`](https://www.youtube.com/@ConceptandCoding)

src/course/README.md

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+# Learning Design Patterns with Java
+
+### Coursera Course: https://www.coursera.org/learn/design-patterns

src/practice/README.md

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+# Implementations of Design Patterns
+
+* ### Examples of [Creational](./creational) Design Patterns with Java:
+
+|              Design Pattern               |                                   Information                                   |                                     Documentation                                     |                                  Video                                  |
+|:-----------------------------------------:|:-------------------------------------------------------------------------------:|:-------------------------------------------------------------------------------------:|:-----------------------------------------------------------------------:|
+|  [Factory Method](./creational/factory)   |  [`refactoring.guru`](https://refactoring.guru/design-patterns/factory-method)  |  [`java-design-patterns`](https://java-design-patterns.com/patterns/factory-method/)  |                                                                         |
+| [Abstract Factory](./creational/notional) | [`refactoring.guru`](https://refactoring.guru/design-patterns/abstract-factory) | [`java-design-patterns`](https://java-design-patterns.com/patterns/abstract-factory/) |                                                                         |
+|      [Builder](./creational/builder)      |     [`refactoring.guru`](https://refactoring.guru/design-patterns/builder)      |     [`java-design-patterns`](https://java-design-patterns.com/patterns/builder/)      | [`@ConceptAndCoding`](https://youtu.be/qOLRxN5eVC0?si=E67H3Rx33vvzY4d_) |
+|     [Object Pool](./creational/pool)      |                                       N/A                                       |   [`java-design-patterns`](https://java-design-patterns.com/patterns/object-pool/)    | [`@ConceptAndCoding`](https://youtu.be/obmc24IHqew?si=q7M84QnN_sbFrku0) |
+|    [Prototype](./creational/prototype)    |    [`refactoring.guru`](https://refactoring.guru/design-patterns/prototype)     |    [`java-design-patterns`](https://java-design-patterns.com/patterns/prototype/)     |                                                                         |
+|    [Singleton](./creational/singleton)    |    [`refactoring.guru`](https://refactoring.guru/design-patterns/singleton)     |    [`java-design-patterns`](https://java-design-patterns.com/patterns/singleton/)     |                                                                         |
+
+* ### Examples of [Structural](./structural) Design Patterns with Java:
+
+|           Design Pattern            |                               Information                                |                                 Documentation                                  |                                  Video                                  |
+|:-----------------------------------:|:------------------------------------------------------------------------:|:------------------------------------------------------------------------------:|:-----------------------------------------------------------------------:|
+|   [Adapter](./structural/adapter)   |  [`refactoring.guru`](https://refactoring.guru/design-patterns/adapter)  |  [`java-design-patterns`](https://java-design-patterns.com/patterns/adapter/)  | [`@ConceptAndCoding`](https://youtu.be/8wrg7IsILhQ?si=PF2kgCqwYN35dgao) |
+|    [Bridge](./structural/bridge)    |  [`refactoring.guru`](https://refactoring.guru/design-patterns/bridge)   |  [`java-design-patterns`](https://java-design-patterns.com/patterns/bridge/)   | [`@ConceptAndCoding`](https://youtu.be/SOw1_W0taBg?si=4TxZSukUZCUYiNWj) |
+| [Composite](./structural/composite) | [`refactoring.guru`](https://refactoring.guru/design-patterns/composite) | [`java-design-patterns`](https://java-design-patterns.com/patterns/composite/) |                                                                         |
+| [Decorator](./structural/decorator) | [`refactoring.guru`](https://refactoring.guru/design-patterns/decorator) | [`java-design-patterns`](https://java-design-patterns.com/patterns/decorator/) | [`@ConceptAndCoding`](https://youtu.be/w6a9MXUwcfY?si=KW_bfuG6F35_blZZ) |
+|    [Facade](./structural/facade)    |  [`refactoring.guru`](https://refactoring.guru/design-patterns/facade)   |  [`java-design-patterns`](https://java-design-patterns.com/patterns/facade/)   | [`@ConceptAndCoding`](https://youtu.be/GYaBXK54eLo?si=aCmexb4t3izwlU9d) |
+| [Flyweight](./structural/flyweight) | [`refactoring.guru`](https://refactoring.guru/design-patterns/flyweight) | [`java-design-patterns`](https://java-design-patterns.com/patterns/flyweight/) |                                                                         |
+|     [Proxy](./structural/proxy)     |   [`refactoring.guru`](https://refactoring.guru/design-patterns/proxy)   |   [`java-design-patterns`](https://java-design-patterns.com/patterns/proxy/)   | [`@ConceptAndCoding`](https://youtu.be/9MxHKlVc6ZM?si=tJME00X4UJ4XJJtc) |
+
+* ### Examples of [Behavioral](./behavioral) Design Patterns with Java:
+
+|                Design Pattern                 |                                      Information                                       |                                        Documentation                                         |                                  Video                                  |
+|:---------------------------------------------:|:--------------------------------------------------------------------------------------:|:--------------------------------------------------------------------------------------------:|:-----------------------------------------------------------------------:|
+| [Chain of Responsibility](./behavioral/chain) | [`refactoring.guru`](https://refactoring.guru/design-patterns/chain-of-responsibility) | [`java-design-patterns`](https://java-design-patterns.com/patterns/chain-of-responsibility/) | [`@ConceptAndCoding`](https://youtu.be/gvIn5QBdGDk?si=30kOIX2x7Gx3MlqR) |
+|        [Command](./behavioral/command)        |         [`refactoring.guru`](https://refactoring.guru/design-patterns/command)         |         [`java-design-patterns`](https://java-design-patterns.com/patterns/command/)         | [`@ConceptAndCoding`](https://youtu.be/E1lce5CWhE0?si=X4HIR777Y9ddFjPS) |
+|                  Interpreter                  |                                          N/A                                           |       [`java-design-patterns`](https://java-design-patterns.com/patterns/interpreter/)       | [`@ConceptAndCoding`](https://youtu.be/fFlPm0pzQYI?si=4DuKSD2Qbt1NQFUE) |
+|       [Iterator](./behavioral/iterator)       |        [`refactoring.guru`](https://refactoring.guru/design-patterns/iterator)         |        [`java-design-patterns`](https://java-design-patterns.com/patterns/iterator/)         | [`@ConceptAndCoding`](https://youtu.be/X7shKHOaYtU?si=F7dk7AZjEOaHpLhv) |
+|       [Mediator](./behavioral/mediator)       |        [`refactoring.guru`](https://refactoring.guru/design-patterns/mediator)         |        [`java-design-patterns`](https://java-design-patterns.com/patterns/mediator/)         |                                                                         |
+|        [Memento](./behavioral/memento)        |         [`refactoring.guru`](https://refactoring.guru/design-patterns/memento)         |         [`java-design-patterns`](https://java-design-patterns.com/patterns/memento/)         | [`@ConceptAndCoding`](https://youtu.be/nTo7e2lpGZ4?si=9wsYjiNs3iG-g0ti) |
+|                  Null Object                  |                                          N/A                                           |       [`java-design-patterns`](https://java-design-patterns.com/patterns/null-object/)       | [`@ConceptAndCoding`](https://youtu.be/iDPhxhamuTo?si=oBsfb-mqRKq764c8) |
+|       [Observer](./behavioral/observer)       |        [`refactoring.guru`](https://refactoring.guru/design-patterns/observer)         |        [`java-design-patterns`](https://java-design-patterns.com/patterns/observer/)         | [`@ConceptAndCoding`](https://youtu.be/Ep9_Zcgst3U?si=Vq--dx8gSRqY7mrH) |
+|          [State](./behavioral/state)          |          [`refactoring.guru`](https://refactoring.guru/design-patterns/state)          |          [`java-design-patterns`](https://java-design-patterns.com/patterns/state/)          |                                                                         |
+|       [Strategy](./behavioral/strategy)       |        [`refactoring.guru`](https://refactoring.guru/design-patterns/strategy)         |        [`java-design-patterns`](https://java-design-patterns.com/patterns/strategy/)         | [`@ConceptAndCoding`](https://youtu.be/u8DttUrXtEw?si=LskxabetaZKy9gKA) |
+|   [Template Method](./behavioral/template)    |     [`refactoring.guru`](https://refactoring.guru/design-patterns/template-method)     |     [`java-design-patterns`](https://java-design-patterns.com/patterns/template-method/)     | [`@ConceptAndCoding`](https://youtu.be/kwy-G1DEm0M?si=yNZlZCuseVQaUCmT) |
+|        [Visitor](./behavioral/visitor)        |         [`refactoring.guru`](https://refactoring.guru/design-patterns/visitor)         |         [`java-design-patterns`](https://java-design-patterns.com/patterns/visitor/)         | [`@ConceptAndCoding`](https://youtu.be/pDsz-AuFO0g?si=11YASEg0NspKyykR) |

src/practice/behavioral/README.md

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+# Examples of `Behavioral` Design Patterns with Java
+
+### Pluralsight Course: https://www.pluralsight.com/courses/design-patterns-java-behavioral
+
+### YouTube Recap Video: https://youtu.be/DBDnUkTobaE?si=-bXWvLOWm9G9moRa

src/practice/creational/README.md

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+# Examples of `Creational` Design Patterns with Java
+
+### Pluralsight Course: https://www.pluralsight.com/courses/java-se-17-creational-design-patterns
+
+### YouTube Recap Video: https://youtu.be/OuNOyFg942M?si=AykaiZsmEG7qHfhx

src/practice/structural/README.md

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+# Examples of `Structural` Design Patterns with Java
+
+### Pluralsight Course: https://www.pluralsight.com/courses/design-patterns-java-structural
+
+### YouTube Recap Video: https://youtu.be/WxGtmIBZszk?si=GUdKyp6vGiS4g94Q