add d3d9 project structure

GDP/D3D9/Window.h

@@ -0,0 +1,16 @@
+#pragma once
+#include <Windows.h>
+
+class Window
+{
+public:
+	INT init(HINSTANCE hInstance, UINT width, UINT height);
+	BOOL run();
+	void deInit();
+
+	HWND getWindowHandle() const { return _hWnd; }
+
+private:
+	HWND _hWnd = nullptr; // handle to window instance
+};
+