Added C demo
Added C demo

HotelsDotCom/rainbow,ccampbell/rainbow,metasyn/rainbow,segmentio/rainbow,metasyn/rainbow,ptigas/rainbow,greyhwndz/rainbow,linuxl0ver/rainbow,javipepe/rainbow,greyhwndz/rainbow,ccampbell/rainbow,linuxl0ver/rainbow,cybrox/rainbow,ptigas/rainbow,metasyn/rainbow,HotelsDotCom/rainbow,greyhwndz/rainbow,segmentio/rainbow,HotelsDotCom/rainbow,javipepe/rainbow,cybrox/rainbow,javipepe/rainbow,jeremykenedy/rainbow,cybrox/rainbow,jeremykenedy/rainbow,linuxl0ver/rainbow,jeremykenedy/rainbow