Update README.md

Bot/Handler/MusicPlayer/PlayCommand/readme.md

@@ -10,22 +10,25 @@ flowchart TD
 
 ```mermaid
 sequenceDiagram
-    participant User as User
-    participant DiscordSocketClient as DiscordSocketClient
-    participant MessageReceivedHandler as MessageReceivedHandler
-    participant MessageReceivedNotification as MessageReceivedNotification
-    participant EmbedBuilder as EmbedBuilder
-    participant Channel as Channel
+    participant User
+    participant Bot
+    participant DiscordSocketClient
+    participant IAudioService
+    participant SocketSlashCommand
+    participant LavalinkPlayer
 
-    User->>DiscordSocketClient: Send message "!LunarisStats"
-    DiscordSocketClient->>MessageReceivedHandler: MessageReceivedNotification
-    MessageReceivedHandler->>MessageReceivedNotification: Handle(notification, cancellationToken)
-    MessageReceivedNotification->>MessageReceivedHandler: BotMentioned(notification, cancellationToken)
-    MessageReceivedHandler->>DiscordSocketClient: Get guilds and voice channels
-    DiscordSocketClient-->>MessageReceivedHandler: List of guilds and voice channels
-    MessageReceivedHandler->>EmbedBuilder: Create embed with statistics
-    EmbedBuilder-->>MessageReceivedHandler: Embed
-    MessageReceivedHandler->>Channel: Send embed message
+    User->>Bot: /play [song]
+    Bot->>DiscordSocketClient: Get user voice channel
+    DiscordSocketClient-->>Bot: Voice channel info
+    Bot->>IAudioService: Get or create player
+    IAudioService-->>Bot: Player instance
+    Bot->>SocketSlashCommand: Get search query
+    SocketSlashCommand-->>Bot: Search query
+    Bot->>IAudioService: Load tracks
+    IAudioService-->>Bot: Track collection
+    Bot->>LavalinkPlayer: Play track
+    LavalinkPlayer-->>Bot: Track started
+    Bot->>User: Now playing embed
 ```
 
 ## Steps in the code

Bot/Handler/MusicPlayer/README.md

@@ -136,4 +136,52 @@ 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.
+