🔊 Add: Music on GameView

DouShouQi_App/DouShouQi_App/Views/GameView.swift

@@ -15,6 +15,12 @@ struct MainMenuView: View {
             TopGameBoard().frame(maxHeight: 200)
             SpriteView(scene: gameScene).frame(width: 950, height: 600)
         }
+        .onAppear {
+            MusicPlayer.shared.playBackgroundMusic(music: "TitleScreenMusic")
+        }
+        .onDisappear {
+            MusicPlayer.shared.stopBackgroundMusic()
+        }
     }
 }