Move solution and projects to src

src/Ryujinx.Graphics.Texture/Region.cs

@@ -0,0 +1,14 @@
+namespace Ryujinx.Graphics.Texture
+{
+    public readonly struct Region
+    {
+        public int Offset { get; }
+        public int Size { get; }
+
+        public Region(int offset, int size)
+        {
+            Offset = offset;
+            Size = size;
+        }
+    }
+}