Add some basic sounds to the actions

[ramondelafuente]

• file bullet
• hit alien
• game over (win)
• game over (loss)

[verschoof]

I think we also want:

• Game music

@michielpapenhove Shall I create the bullet and alien hit sounds? 😂 👼 (depends how serious we want it ofc?)

[michielpapenhove]

I think we also want:

• Game music

@michielpapenhove Shall I create the bullet and alien hit sounds? 😂 👼 (depends how serious we want it ofc?)

Sure, go right ahead :)