Move solution and projects to src

src/Ryujinx.Audio.Backends.SoundIo/Native/SoundIoError.cs

@@ -0,0 +1,22 @@
+namespace Ryujinx.Audio.Backends.SoundIo.Native
+{
+    public enum SoundIoError
+    {
+        None = 0,
+        NoMem = 1,
+        InitAudioBackend = 2,
+        SystemResources = 3,
+        OpeningDevice = 4,
+        NoSuchDevice = 5,
+        Invalid = 6,
+        BackendUnavailable = 7,
+        Streaming = 8,
+        IncompatibleDevice = 9,
+        NoSuchClient = 10,
+        IncompatibleBackend = 11,
+        BackendDisconnected = 12,
+        Interrupted = 13,
+        Underflow = 14,
+        EncodingString = 15,
+    }
+}