Update README.md

Bot/Handler/MusicPlayer/README.md

@@ -136,4 +136,104 @@ sequenceDiagram
     end
 ```
 
-This README provides an overview of the handlers and their responsibilities, along with class and sequence diagrams to illustrate the interactions and relationships between the components.
+## Extensions.cs
+
+#### Namespaces
+- **Discord**: Provides classes for interacting with Discord.
+- **Discord.WebSocket**: Provides WebSocket-specific classes for Discord.
+- **Lavalink4NET**: Provides classes for interacting with Lavalink.
+- **Lavalink4NET.Players**: Provides player-related classes for Lavalink.
+- **Lavalink4NET.Players.Queued**: Provides queued player-related classes for Lavalink.
+- **Microsoft.Extensions.Options**: Provides classes for handling options and configurations.
+
+#### Class: `Extensions`
+This static class contains extension methods for various Discord and Lavalink operations.
+
+##### Method: `GetPlayerAsync`
+- **Parameters**:
+  - `IAudioService audioService`: The audio service to retrieve the player from.
+  - `DiscordSocketClient client`: The Discord client.
+  - `SocketSlashCommand context`: The context of the slash command.
+  - `bool connectToVoiceChannel`: Whether to connect to the voice channel (default is true).
+- **Returns**: `ValueTask<QueuedLavalinkPlayer?>`
+- **Description**: Retrieves a `QueuedLavalinkPlayer` for the given context. If the retrieval fails, it returns null and sends an appropriate error message.
+
+##### Method: `GetGuild`
+- **Parameters**:
+  - `SocketSlashCommand message`: The slash command message.
+  - `DiscordSocketClient client`: The Discord client.
+- **Returns**: `SocketGuild`
+- **Description**: Retrieves the guild associated with the given slash command message. Throws an exception if the guild ID is null.
+
+##### Method: `GetVoiceState`
+- **Parameters**:
+  - `SocketSlashCommand message`: The slash command message.
+- **Returns**: `IVoiceState`
+- **Description**: Retrieves the voice state of the user who issued the slash command. Throws an exception if the user is not connected to a voice channel.
+
+##### Method: `RespondAsync`
+- **Parameters**:
+  - `SocketSlashCommand message`: The slash command message.
+  - `string content`: The content of the response.
+- **Returns**: `Task`
+- **Description**: Sends an ephemeral response to the slash command.
+
+##### Method: `GetOptionValueByName`
+- **Parameters**:
+  - `SocketSlashCommand command`: The slash command.
+  - `string optionName`: The name of the option to retrieve the value for.
+- **Returns**: `string`
+- **Description**: Retrieves the value of the specified option from the slash command. Returns an empty string if the option is not found.
+
+# MessageModule
+
+The `MessageModule` class provides utility methods for sending and removing messages in a Discord guild using the Discord.Net library. It maintains a dictionary to keep track of message IDs for each guild, allowing for easy removal of messages when needed.
+
+## Methods
+
+### `SendMessageAsync(SocketSlashCommand context, string message, DiscordSocketClient client)`
+
+Sends a follow-up message with the specified text content in response to a slash command.
+
+- **Parameters:**
+  - `context`: The `SocketSlashCommand` context in which the command was executed.
+  - `message`: The text content of the message to be sent.
+  - `client`: The `DiscordSocketClient` instance.
+
+### `SendMessageAsync(SocketSlashCommand context, Embed message, DiscordSocketClient client)`
+
+Sends a follow-up message with the specified embed content in response to a slash command.
+
+- **Parameters:**
+  - `context`: The `SocketSlashCommand` context in which the command was executed.
+  - `message`: The `Embed` content of the message to be sent.
+  - `client`: The `DiscordSocketClient` instance.
+
+### `RemoveMessages(SocketSlashCommand context, DiscordSocketClient client)`
+
+Removes all tracked messages for the guild in which the command was executed.
+
+- **Parameters:**
+  - `context`: The `SocketSlashCommand` context in which the command was executed.
+  - `client`: The `DiscordSocketClient` instance.
+
+### `StoreForRemoval(SocketSlashCommand context, DiscordSocketClient client)`
+
+Stores the message ID for removal and deletes any previously tracked messages for the guild.
+
+- **Parameters:**
+  - `context`: The `SocketSlashCommand` context in which the command was executed.
+  - `client`: The `DiscordSocketClient` instance.
+
+- **Returns:**
+  - The guild ID as a `ulong`.
+
+## Usage
+
+To use the `MessageModule` class, simply call the appropriate method from your command handling logic. For example:
+
+```csharp
+await context.SendMessageAsync("Hello, world!", client);
+```
+
+This will send a follow-up message with the text "Hello, world!" in response to the slash command.