made preparations for buttons by making necessary imports from pyglet_gui and creating a theme. Now only draws from on_draw() because pyglet doesn't draw from initialisation from some reason. I also tried moving the initial drawing to on_activate() or on_expose() but neither would draw as intended.
Updated requirements to include Pyglet_gui, made the instructions clearer thanks to https://github.com/jorgecarleitao/pyglet-gui . Also included  which I expect to get larger later on.