Move solution and projects to src

src/Ryujinx.Graphics.Device/RwCallback.cs

@@ -0,0 +1,16 @@
+using System;
+
+namespace Ryujinx.Graphics.Device
+{
+    public readonly struct RwCallback
+    {
+        public Action<int> Write { get; }
+        public Func<int> Read { get; }
+
+        public RwCallback(Action<int> write, Func<int> read)
+        {
+            Write = write;
+            Read = read;
+        }
+    }
+}