Edit the code from the tank game so that it will:
- play an explosion sound when a target is hit or run over
- play a gunshot sound when a bullet is "fired" (created)
- play background music during the whole game
You can either use the provided .wav files or find your own (responsibly, of course).
pygame.initis inside App's init method, we don't put sounds here. instead, we make the sounds and the music inside Tankgame's init method. Alternatively, you can move
pygame.initbefore all the classes so that you can have your sounds as constants.