Add chinese doc about how to write new operators.
Add chinese doc about how to write new operators.

Canpio/Paddle,PaddlePaddle/Paddle,tensor-tang/Paddle,hedaoyuan/Paddle,hedaoyuan/Paddle,luotao1/Paddle,putcn/Paddle,tensor-tang/Paddle,baidu/Paddle,lispc/Paddle,PaddlePaddle/Paddle,lispc/Paddle,chengduoZH/Paddle,yu239/Paddle,QiJune/Paddle,jacquesqiao/Paddle,QiJune/Paddle,jacquesqiao/Paddle,pengli09/Paddle,hedaoyuan/Paddle,chengduoZH/Paddle,Canpio/Paddle,tensor-tang/Paddle,lispc/Paddle,Canpio/Paddle,pengli09/Paddle,hedaoyuan/Paddle,jacquesqiao/Paddle,pengli09/Paddle,QiJune/Paddle,reyoung/Paddle,Canpio/Paddle,reyoung/Paddle,reyoung/Paddle,chengduoZH/Paddle,lcy-seso/Paddle,lispc/Paddle,Canpio/Paddle,PaddlePaddle/Paddle,pkuyym/Paddle,hedaoyuan/Paddle,luotao1/Paddle,yu239/Paddle,putcn/Paddle,lispc/Paddle,pkuyym/Paddle,luotao1/Paddle,tensor-tang/Paddle,PaddlePaddle/Paddle,hedaoyuan/Paddle,Canpio/Paddle,pengli09/Paddle,luotao1/Paddle,chengduoZH/Paddle,Canpio/Paddle,Canpio/Paddle,pkuyym/Paddle,lcy-seso/Paddle,yu239/Paddle,baidu/Paddle,lispc/Paddle,jacquesqiao/Paddle,hedaoyuan/Paddle,reyoung/Paddle,reyoung/Paddle,pengli09/Paddle,yu239/Paddle,lcy-seso/Paddle,yu239/Paddle,putcn/Paddle,hedaoyuan/Paddle,baidu/Paddle,PaddlePaddle/Paddle,pkuyym/Paddle,QiJune/Paddle,baidu/Paddle,PaddlePaddle/Paddle,yu239/Paddle,putcn/Paddle,tensor-tang/Paddle,lcy-seso/Paddle,jacquesqiao/Paddle,pkuyym/Paddle,lispc/Paddle,lcy-seso/Paddle,luotao1/Paddle,luotao1/Paddle,lispc/Paddle,luotao1/Paddle,QiJune/Paddle,baidu/Paddle,pengli09/Paddle,yu239/Paddle,putcn/Paddle,QiJune/Paddle,chengduoZH/Paddle,yu239/Paddle,jacquesqiao/Paddle,putcn/Paddle,pengli09/Paddle,reyoung/Paddle,lcy-seso/Paddle,PaddlePaddle/Paddle,pengli09/Paddle,pkuyym/Paddle