Add custom audio settings

src/Ryujinx/UI/Views/Settings/CustomSettingsAudioView.axaml.cs

@@ -0,0 +1,12 @@
+using Avalonia.Controls;
+
+namespace Ryujinx.Ava.UI.Views.Settings
+{
+    public partial class CustomSettingsAudioView : UserControl
+    {
+        public CustomSettingsAudioView()
+        {
+            InitializeComponent();
+        }
+    }
+}