Added: D3D9 project and window creation

GDP/D3D9/Utilities.cpp

@@ -0,0 +1,14 @@
+#include "Utilities.h"
+
+void ShowError(UINT error)
+{
+#if _DEBUG
+	LPCTSTR msg = TEXT("Application quit with an error: ");
+#if UNICODE
+	msg = (std::wstring(msg) + std::to_wstring(error)).c_str();
+#else // UNICODE
+	msg = (std::string(msg) + std::to_string(error)).c_str();
+#endif // UNICODE
+	MessageBox(nullptr, msg, TEXT("Error"), MB_OK);
+#endif // DEBUG
+}