Move solution and projects to src

src/Ryujinx.Audio/Integration/IWritableEvent.cs

@@ -0,0 +1,18 @@
+namespace Ryujinx.Audio.Integration
+{
+    /// <summary>
+    /// Represent a writable event with manual clear.
+    /// </summary>
+    public interface IWritableEvent
+    {
+        /// <summary>
+        /// Signal the event.
+        /// </summary>
+        void Signal();
+
+        /// <summary>
+        /// Clear the signaled state of the event.
+        /// </summary>
+        void Clear();
+    }
+}