sdl2-hello-world/docs/reference/files/config.ini

[Video]
Width=640
Height=480

[Controls.0.Keyboard]
Right=Right
Down=Down
Left=Left
Up=Up
Affirm=Return
Negate=Backspace
Action0=A
Action1=S
Action2=D
Action3=F
Action4=Z
Action5=X
Action6=C
Action7=V
Action8=W
Action9=E