added options section to readme
added options section to readme

xat/castnow,Enchufa2/castnow,apopen/castnow,maliciamrg/castnow,burk3/castnow,gesellix/castnow,hoatle/castnow,send2moran/MP4_Convertor,vivekjuneja/castnow,mafintosh/castnow,jamespfinn/castnow,RobertoMalatesta/castnow,send2moran/MP4_Convertor,rk222ev/castnow,walison17/castnow,maliciamrg/castnow,robinst/castnow,jpetazzo/castnow