Fixes for csharp

csharp/src/Emulator.XNA/AudioPlayer.cs

@@ -0,0 +1,29 @@
+// Copyright (c) Coderox AB. All Rights Reserved.
+// Licensed under the MIT License. See LICENSE in the project root for license information.
+
+/// <summary>
+/// Represents an audio player for the emulator.
+/// </summary>
+internal class AudioPlayer : IAudio
+{
+    /// <summary>
+    /// Gets a value indicating whether the audio player is currently playing.
+    /// </summary>
+    public bool IsPlaying => false;
+
+    /// <summary>
+    /// Starts playing the audio.
+    /// </summary>
+    public void Start()
+    {
+        throw new System.NotImplementedException();
+    }
+
+    /// <summary>
+    /// Stops playing the audio.
+    /// </summary>
+    public void Stop()
+    {
+        throw new System.NotImplementedException();
+    }
+}

csharp/src/Emulator.XNA/Emulator.XNA.cs

@@ -5,7 +5,6 @@ namespace Chip8;
 
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Graphics;
-using System.Xml.Schema;
 using Input = Microsoft.Xna.Framework.Input;
 
 /// <summary>
@@ -59,7 +58,8 @@ protected override void Initialize()
 
         var random = new RandomNumberGenerator();
         var registers = new Registers();
-        this.cpu = new CPU(this.memory, registers, random, this.keyboard, screen);
+        var audio = new AudioPlayer();
+        this.cpu = new CPU(this.memory, registers, random, this.keyboard, screen, audio);
 
         this.GraphicsDevice.SamplerStates[0] = SamplerState.PointWrap;