Updated README

Animation uses CABasicAnimation rather than the new UIView animation
API from iOS7, so it should be fine to use in iOS6.
Added README to xcode project
Added MIT license
Added property to set popUpViewColor as a single UIColor value
Don't forget to set property value
Set default color using 'popUpViewColor' property
Renamed property - 'popUpViewAnimatedColors' is more descriptive
updated README