smaller reformating and added open source licence

README.md

data/data.png

source/api/components/rigidbody.py

source/api/management/background_manager.py

source/api/ui/button.py

source/api/ui/button_style.py

source/api/ui/panel.py

source/api/ui/slider.py

source/game/scenes/main_menu.py

source/game/scenes/main_pinball.py

source/game/scenes/submenus/end_menu.py