A simple drawing App.
On the right are 3 to 5 buttons:
X: Closes the drawing App.
M: Shows the menu.
You can load and save your images and select between pencil, rectangle and circle there.
C: Shows a menu with different colors to select from.
->: One step further if you pressed the step-back button.
<-: One step back.
The App draws on its own pygame surface which is then drawed on the screen.