added documentation, how to include Crouton, but excluding the support dependency
added documentation, how to include Crouton, but excluding the support dependency

jferlisi/Crouton,Appstrakt/Crouton,keyboardsurfer/Crouton,loulousky/Crouton,chwnFlyPig/Crouton,beamly/Crouton,java02014/Crouton,zllbird/Crouton,xu33liang33/Crouton,kzganesan/Crouton,simple88/Crouton,hgl888/Crouton,yummy222/Crouton,remind101/Crouton,pengleelove/Crouton,Brooks0129/Crouton,coreform/Crouton,zhaochuanTeam/Crouton,mikepenz/Crouton,wangwangheng/Crouton,hejunbinlan/Crouton,hongnguyenpro/Crouton