Add comprehensive music system documentation to the guide

Document the new music system, including its commands and features, in the replit.md file.

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replit.md

@@ -64,6 +64,29 @@ Users can spend their XP on items configured by server admins.
 | Boosts | Temporary XP multipliers |
 | Custom | Server-specific rewards |
 
+### 6. Music System
+Full-featured music player using discord-player.
+
+| Command | Description |
+|---------|-------------|
+| `/music play` | Play a song or playlist (YouTube, Spotify, SoundCloud) |
+| `/music skip` | Skip the current track |
+| `/music stop` | Stop playback and clear queue |
+| `/music pause` | Pause the current track |
+| `/music resume` | Resume playback |
+| `/music queue` | View the current queue |
+| `/music nowplaying` | Show currently playing track with progress bar |
+| `/music volume` | Adjust volume (0-100) |
+| `/music shuffle` | Shuffle the queue |
+| `/music loop` | Set loop mode (off/track/queue) |
+
+**Features:**
+- Supports YouTube, Spotify, SoundCloud, Apple Music
+- Automatic queue management
+- Now playing embeds with thumbnails
+- Progress bar display
+- Automatic disconnect after queue ends
+
 ---
 
 ## Security & Moderation