doc: separate out readme content

doc/contributors.md

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+## Main Contributors
+
+<table>
+  <tr>
+    <td align="center"><a href="https://github.com/vatsaltanna"><img src="https://avatars.githubusercontent.com/u/25323183?s=100" width="100px;" alt=""/><br /><sub><b>Vatsal Tanna</b></sub></a></td>
+    <td align="center"><a href="https://github.com/DhvanitVaghani"><img src="https://avatars.githubusercontent.com/u/64645989?v=4" width="100px;" alt=""/><br /><sub><b>Dhvanit Vaghani</b></sub></a></td>
+    <td align="center"><a href="https://github.com/Ujas-Majithiya"><img src="https://avatars.githubusercontent.com/u/56400956?v=4" width="100px;" alt=""/><br /><sub><b>Ujas Majithiya</b></sub></a></td>
+    <td align="center"><a href="https://github.com/apurva780"><img src="https://avatars.githubusercontent.com/u/65003381?v=4" width="100px;" alt=""/><br /><sub><b>Apurva Kanthraviya</b></sub></a></td>
+    <td align="center"><a href="https://github.com/aditya-chavda"><img src="https://avatars.githubusercontent.com/u/41247722?v=4" width="100px;" alt=""/><br /><sub><b>Aditya Chavda</b></sub></a></td>
+  </tr>
+</table>
+<br/>

doc/how_to_use.md

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+## How to use
+
+Check out [blog](https://medium.com/simform-engineering/chatview-a-cutting-edge-chat-ui-solution-7367b1f9d772) for better understanding and basic implementation.
+
+Also, for whole example, check out the **example** app in the [example](https://github.com/SimformSolutionsPvtLtd/flutter_chatview/tree/main/example) directory or the 'Example' tab on pub.dartlang.org for a more complete example.

doc/installation.md

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+1. Add dependencies to `pubspec.yaml`
+
+   Get the latest version in the 'Installing' tab
+   on [pub.dev](https://pub.dev/packages/chatview/install)
+
+    ```yaml
+    dependencies:
+        chatview: <latest-version>
+    ```
+
+2. Run pub get.
+
+   ```shell
+   flutter pub get
+   ```
+
+3. Import package.
+
+    ```dart
+    import 'package:chatview/chatview.dart';
+    ```

doc/migration_guide.md

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+## Migration guide for release 2.0.0
+
+- Renamed `sendBy` field to `sentBy` in `Message` class.
+
+- Renamed `chatUsers` field to `otherUsers` in `ChatController` class.
+
+- Moved `currentUser` field from `ChatView` widget to `ChatController` class
+
+- Updated `id` value in `copyWith` method of `Message` to have correct value.
+
+- Removed `showTypingIndicator` field from `ChatView` and replaced it with `ChatController.showTypingIndicator`.
+
+  Before:
+    ```dart
+    ChatView(
+      showTypingIndicator:false,
+    ),
+    ```
+
+  After:
+    ```dart
+    /// use it with your [ChatController] instance.
+    _chatContoller.setTypingIndicator = true; // for showing indicator
+    _chatContoller.setTypingIndicator = false; // for hiding indicator
+    ```
+
+- Updated `ChatUser`, `Message` and `ReplyMessage` Data Model's `fromJson` and `toJson` methods:
+
+  ##### in `ChatUser.fromJson`:
+
+  Before:
+    ```dart
+    ChatUser.fromJson(
+      { 
+        ...
+        'imageType': ImageType.asset,
+        ...
+      },
+    ),
+    ```
+
+  After:
+    ```dart
+    ChatUser.fromJson(
+      {
+        ...
+        'imageType': 'asset',
+        ...
+      },
+    ),
+    ```
+
+  ##### in `ChatUser.toJson`:
+
+  Before:
+    ```dart
+    {
+      ...
+      imageType: ImageType.asset,
+      ...
+    }
+    ```
+
+  After:
+    ```dart
+    {
+      ...
+      imageType: asset,
+      ...
+    }
+    ```
+
+  ##### in `Message.fromJson`:
+
+  Before:
+    ```dart
+    Message.fromJson(
+      {
+        ...
+        'createdAt': DateTime.now(),
+        'message_type': MessageType.text,
+        'voice_message_duration': Duration(seconds: 5),
+        ...
+      }
+    )
+    ```
+
+  After:
+    ```dart
+    Message.fromJson(
+      {
+        ...
+        'createdAt': '2024-06-13T17:32:19.586412',
+        'message_type': 'text',
+        'voice_message_duration': '5000000',
+        ...
+      }
+    )
+    ```
+
+  ##### in `Message.toJson`:
+
+  Before:
+    ```dart
+    {
+      ...
+      createdAt: 2024-06-13 17:23:19.454789,
+      message_type: MessageType.text,
+      voice_message_duration: 0:00:05.000000,
+      ...
+    }
+    ```
+
+  After:
+    ```dart
+    {
+      ...
+      createdAt: 2024-06-13T17:32:19.586412,
+      message_type: text,
+      voice_message_duration: 5000000,
+      ...
+    }
+    ```
+
+  ##### in `ReplyMessage.fromJson`:
+
+  Before:
+    ```dart
+    ReplyMessage.fromJson(
+      {
+        ...
+        'message_type': MessageType.text,  
+        'voiceMessageDuration': Duration(seconds: 5),
+        ...
+      }
+    )
+    ```
+
+  After:
+    ```dart
+    ReplyMessage.fromJson(
+      {
+        ...
+        'message_type': 'text',  
+        'voiceMessageDuration': '5000000',
+        ...
+      }
+    )
+    ```
+
+  in `ReplyMessage.toJson`:
+
+  Before:
+    ```dart
+    {
+      ...
+      message_type: MessageType.text,
+      voiceMessageDuration: 0:00:05.000000,
+      ...
+    }
+    ```
+
+  After:
+    ```dart
+    {
+      ...
+      message_type: text,
+      voiceMessageDuration: 5000000,
+      ...
+    }
+    ```