add example of clone(for_test)
add example of clone(for_test)

luotao1/Paddle,luotao1/Paddle,PaddlePaddle/Paddle,tensor-tang/Paddle,PaddlePaddle/Paddle,PaddlePaddle/Paddle,QiJune/Paddle,jacquesqiao/Paddle,QiJune/Paddle,tensor-tang/Paddle,luotao1/Paddle,luotao1/Paddle,baidu/Paddle,chengduoZH/Paddle,luotao1/Paddle,baidu/Paddle,baidu/Paddle,jacquesqiao/Paddle,QiJune/Paddle,baidu/Paddle,jacquesqiao/Paddle,jacquesqiao/Paddle,PaddlePaddle/Paddle,reyoung/Paddle,chengduoZH/Paddle,QiJune/Paddle,chengduoZH/Paddle,reyoung/Paddle,PaddlePaddle/Paddle,reyoung/Paddle,PaddlePaddle/Paddle,PaddlePaddle/Paddle,tensor-tang/Paddle,reyoung/Paddle,tensor-tang/Paddle,QiJune/Paddle,tensor-tang/Paddle,chengduoZH/Paddle,luotao1/Paddle,jacquesqiao/Paddle,reyoung/Paddle,QiJune/Paddle,baidu/Paddle,jacquesqiao/Paddle,reyoung/Paddle,luotao1/Paddle,chengduoZH/Paddle