Move solution and projects to src

src/Ryujinx.Graphics.GAL/BufferHandle.cs

@@ -0,0 +1,14 @@
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Graphics.GAL
+{
+    [StructLayout(LayoutKind.Sequential, Size = 8)]
+    public readonly record struct BufferHandle
+    {
+        private readonly ulong _value;
+
+        public static BufferHandle Null => new BufferHandle(0);
+
+        private BufferHandle(ulong value) => _value = value;
+    }
+}