Add fast-Play method to AudioMixer (#158)

* Add fast-Play method to AudioMixer

* Update src/Plugin.Maui.Audio/AudioMixer/AudioMixer.cs

---------

Co-authored-by: Gerald Versluis <[email protected]>

Author: taublast

src/Plugin.Maui.Audio/AudioMixer/AudioMixer.cs

@@ -70,6 +70,19 @@ public AudioMixer(IAudioManager audioManager, int numberOfChannels)
 		}
 	}
 
+	/// <summary>
+	/// Play an already prepared channel.
+	/// </summary>
+	/// <param name="channelIndex">The index of the channel to play the sound on.</param>
+	/// <param name="loop">Indicates whether the audio should loop.</param>
+	public void Play(int channelIndex, bool loop = false)
+	{
+		ValidateChannelIndex(channelIndex);
+		var player = channels[channelIndex];
+		player.Loop = loop;
+		player.Play();
+	}
+ 
 	/// <summary>
 	/// Plays the specified audio clip on the given channel.
 	/// </summary>