Update readme.md

Bot/Handler/MusicPlayer/PlayCommand/readme.md

@@ -8,6 +8,75 @@ flowchart TD
     PlayTrack --> NowPlayingEmbed
 ```
 
+```mermaid
+classDiagram
+    class PlayHandler {
+        -MusicEmbed _musicEmbed
+        -DiscordSocketClient _client
+        -IAudioService _audioService
+        -SocketSlashCommand _context
+        -const int MaxTrackDuration
+        -LavalinkTrack? _previousTrack
+        -static HashSet~ulong~ SubscribedGuilds
+        +PlayHandler(DiscordSocketClient client, MusicEmbed musicEmbed, IAudioService audioService)
+        +Task Handle(PlayCommand command, CancellationToken cancellationToken)
+        -void PlayMusic()
+        -Task OnTrackEnded(object sender, TrackEndedEventArgs eventargs)
+        -Task OnTrackStarted(object sender, TrackStartedEventArgs eventargs)
+        -void RegisterTrackStartedEventListerner(PlayCommand command)
+        -static Task ApplyFilters(CancellationToken cancellationToken, QueuedLavalinkPlayer player)
+        -static Task ConfigureSponsorBlock(CancellationToken cancellationToken, QueuedLavalinkPlayer player)
+    }
+
+    class PlayCommand {
+        +SocketSlashCommand Message
+    }
+
+    class TrackEndedEventArgs {
+    }
+
+    class TrackStartedEventArgs {
+    }
+
+    class QueuedLavalinkPlayer {
+        +LavalinkTrack? CurrentTrack
+        +Task PlayAsync(LavalinkTrack track, CancellationToken cancellationToken)
+        +Task Queue.AddRangeAsync(List~TrackQueueItem~ queueTracks, CancellationToken cancellationToken)
+        +Task Filters.SetFilter(NormalizationFilter normalizationFilter)
+        +Task Filters.CommitAsync(CancellationToken cancellationToken)
+        +Task UpdateSponsorBlockCategoriesAsync(ImmutableArray~SegmentCategory~ categories, CancellationToken cancellationToken)
+    }
+
+    class LavalinkTrack {
+        +string Identifier
+    }
+
+    class NormalizationFilter {
+        +NormalizationFilter(double gain, bool enabled)
+    }
+
+    class SegmentCategory {
+        +static SegmentCategory Intro
+        +static SegmentCategory Sponsor
+        +static SegmentCategory SelfPromotion
+        +static SegmentCategory Outro
+        +static SegmentCategory Filler
+    }
+
+    class TrackQueueItem {
+        +TrackQueueItem(LavalinkTrack track)
+    }
+
+    PlayHandler --> PlayCommand
+    PlayHandler --> TrackEndedEventArgs
+    PlayHandler --> TrackStartedEventArgs
+    PlayHandler --> QueuedLavalinkPlayer
+    PlayHandler --> LavalinkTrack
+    PlayHandler --> NormalizationFilter
+    PlayHandler --> SegmentCategory
+    PlayHandler --> TrackQueueItem
+```
+
 ## Steps in the code
 
 | Name | Description |