A BIG commit :smiley: Hope nothing screws up.

Soo............ I was working all night cause I was in a coding mood.

Added sound -
We have an AudioManager class.
7 BGM tracks for 7 Levels, I chose the appropriately.

Renamed FlappyBird to MonochromeRainbow. That was a pain.

Tried to implement a menu screen and failed. So I gave up to wait to ask
you guys.