update readme
update readme

xiaochen2012/CBoard,yzhang921/CBoard,junjiem/CBoard,yzhang921/CBoard,junjiem/CBoard,yzhang921/CBoard,hjtoday/CBoard,hjtoday/CBoard,bigdata-eqxiu/CBoard,hjtoday/CBoard,xiaochen2012/CBoard,bigdata-eqxiu/CBoard,junjiem/CBoard,hjtoday/CBoard,bigdata-eqxiu/CBoard,junjiem/CBoard,bigdata-eqxiu/CBoard,xiaochen2012/CBoard,yzhang921/CBoard,xiaochen2012/CBoard