Create window

Program creates an OpenGL window that can be resized or go fullscreen. Nothing drawn inside the window yet.

src/game.h

@@ -0,0 +1,12 @@
+#include <stdbool.h>
+
+typedef struct
+{
+	bool running;
+	SDL_Window *window;
+	SDL_GLContext *glContext;
+} GameState;
+
+GameState *Game_New();
+void Game_Update(GameState *gs);
+void Game_Destroy(GameState *gs);