Updated readme and a current screenshot of game (it's nothing really)

Messed around with movement, learned lots about cocos2d movement libs

Created a variant of MoveTo, which depends on whether or not object
reaches destination rather than a duration (so I can add lots of
fluctuations to the path e.g. random walk)

Current Status: Cell spawns, moves to another point via pseudo-biased
random walk. (a true biased random walk could be cool in the future)