Move solution and projects to src

src/Ryujinx.Graphics.Texture/Size.cs

@@ -0,0 +1,16 @@
+namespace Ryujinx.Graphics.Texture
+{
+    public readonly struct Size
+    {
+        public int Width  { get; }
+        public int Height { get; }
+        public int Depth  { get; }
+
+        public Size(int width, int height, int depth)
+        {
+            Width  = width;
+            Height = height;
+            Depth  = depth;
+        }
+    }
+}