0.2.2 Scores!

-Added particle effects for when an asteroid gets destroyed

-Added a scoring system
--> smallest asteroids: 50 points
--> small asteroids: 100 points
--> medium asteroids: 200 points
--> bigger medium asteroids: 400 points
--> big asteroids: 500 points
--> large asteroids 750 points

-Added so that if a bigger asteroid hit the player you lose more lives
--> small-big asteroids: 1 life
--> large asteroids: 2 lives

-Added an exit button in the pong and asteroids game to go back to the main menu