Added some structuring.

The game runs but only a black window is shown.

src/gameplaysceneclassic.hpp

@@ -0,0 +1,21 @@
+#ifndef idF6FF1F57C36842DC9B20E2F55C507C2E
+#define idF6FF1F57C36842DC9B20E2F55C507C2E
+
+#include "gameplayscene.hpp"
+
+namespace cloonel {
+	class SDLMain;
+
+	class GameplaySceneClassic : public GameplayScene {
+	public:
+		explicit GameplaySceneClassic ( SDLMain* parSdlMain );
+		~GameplaySceneClassic ( void ) noexcept;
+
+		virtual void Prepare ( void );
+		virtual void Destroy ( void ) noexcept;
+
+	private:
+	};
+} //namespace cloonel
+
+#endif