Update README with Collision Penalty Information

Collision Penalties:

-Intentional collisions onto already occupied squares will result in:
	
	Damage = 1 for enemy piece
	
	Chance of Damage = 5 for home piece

-An accidental head-on collision is when both teams move to the same square on the same tuen:
	
	Damage = 5 for both the home and enemy piece