Added Vim

vim/README.md

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+# VIM
+
+## What is VIM ? 
+
+Vim is an improved version of the **vi** editor distributed with **Linux and UNIX** systems. Vim is highly
+configurable and efficient for ***practiced users***, including such features as split screen editing, color
+formatting, and highlighting for editing text.
+
+## Why to learn VIM ? 
+
+- You should know how to use at least one text editor that can be used from a **text-only shell prompt**.
+- The key reason is that Vim is **almost
+always installed on a server**, if any text editor is present.
+
+## VIM Modes : 
+![](./imgs/vim_modes.png)
+
+### **Command mode** *aka* **Normal Mode** :
+- Is the default mode that **vim start in** and we can navigate among other modes through it.
+- This mode is the place that we spent most our time in.
+- **To return to this mode** from other modes see the image above.
+
+### **Insert Mode** : 
+- Is the second most used mode in **vim** .
+- As the name indicate .. it's used to insert text to the file that we use . 
+- To enter this mode press `i` 
+
+### **Visual mode** :
+- It's used to select text similar to how clicking and dragging with a mouse behaves. 
+ - **After selecting text** using the visual mode you can return back to the **command mode** and copy ,paste or delete the selected text using the keys `y` `p` `x` **in order**.
+- #### **Visual mode types** : 
+    1. #### **Character mode  :**
+        Select **single characters**.
+        to enter this mode press `v`
+
+    2. #### **Line mode :**
+        Select text **by line**.\
+        to enter this mode press `Shift + v`
+    3. #### **Block mode :** 
+        **Rectangle selection** of text.
+        to enter this mode press `Ctrl + v`
+
+### **Extended Command mode :**
+- To enter this mode press `:`
+- used to give vim commands\
+***Examples:***
+    1. `:w` to save changes made to the file.
+    2. `:wq` save the changes then **exit vim**.
+    3. `:q!` discard the chnages we made and then **exit vim**.
+## *Notes* : 
+- Before switching between different modes you should **return to the command mode first**\
+**Example**: \
+If I want to switch from **insert mode** to **visual mode** I should first return to the commmand mode by pressing `Esc` and then enter the insert mode by pressing `i` .
+- You can move inside the file using the **arrow keys** in any mode , but it's considered a **good practise to return to the command mode and using (h,j,k,l)** instead. 
+
+    ![](./imgs/vim_keys.jpeg)
+
+    play this game to get your self familier with using the **(h,j,k,l)** keys => [vim-adventure](https://vim-adventures.com/)
+
+- To **undo** the last change enter the  **command mode** then type `u` and to **redo** press `Ctrl+r`
+- To go to the start of a file enter the **command mode** then type `gg` and to go to the end of a file type `G` (can be useful when dealing with large files).
+
+## Extend your knowledge : 
+- Run the command `vimtutor` and read through the output .
+- https://www.freecodecamp.org/news/vim-editor-modes-explained/
+- **practise..practise..practise**