Adding descriptor skeleton

src/Engine/Graphics/Metal/Descriptor.h

@@ -0,0 +1,23 @@
+#pragma once
+#include "Graphics/Descriptor.h"
+
+namespace Seele {
+namespace Metal {
+DECLARE_REF(Graphics)
+class DescriptorLayout : public Gfx::DescriptorLayout
+{
+public:
+  DescriptorLayout(PGraphics graphics, const std::string& name);
+  virtual ~DescriptorLayout();
+  virtual void create();
+private:
+  PGraphics graphics;
+};
+class PipelineLayout : public Gfx::PipelineLayout
+{
+public:
+private:
+
+};
+}
+}