update galaxy_client.md and add galaxy_rec_client.md in doc
update galaxy_client.md and add galaxy_rec_client.md in doc

baidu/galaxy,taotaowill/galaxy,taotaowill/galaxy,May2016/galaxy,baidu/galaxy,May2016/galaxy,Kai-Zhang/galaxy,May2016/galaxy,baidu/galaxy,taotaowill/galaxy,Kai-Zhang/galaxy,Kai-Zhang/galaxy