Split sdlpp into smaller files

sdlpp/sdlpp_window.hpp

@@ -0,0 +1,24 @@
+#ifndef SDLPP_HPP_WINDOW
+#define SDLPP_HPP_WINDOW
+
+#include "sdlpp_common.hpp"
+
+#include <iostream>
+
+namespace SDLPP {
+class Window {
+public:
+    Window();
+    Window( const std::string &window_name );
+    Window( const std::string &window_name, uint32_t width, uint32_t height );
+    Window( const std::string &window_name, uint32_t width, uint32_t height,
+            uint32_t posx, uint32_t posy );
+    void setResizable( bool resizable );
+    virtual ~Window();
+    SDL_Window *getWindowPtr();
+
+private:
+    SDL_Window *window = NULL;
+};
+} // namespace SDLPP
+#endif