Merge branch 'develop' of https://github.com/PaddlePaddle/Serving into supplement-grpc-impl

README.md

@@ -184,6 +184,12 @@ Here, `client.predict` function has two arguments. `feed` is a `python dict` wit
 
 <h2 align="center">Community</h2>
 
+### User Group in China
+
+  
+<p align="center"><img width="200" height="300" margin="500" src="./doc/qq.jpeg"/>&#8194;&#8194;&#8194;&#8194;&#8194<img width="200" height="300"  src="doc/wechat.jpeg"/></p>
+<p align="center">PaddleServing交流QQ群&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;PaddleServing微信群</p>    
+
 ### Slack
 
 To connect with other users and contributors, welcome to join our [Slack channel](https://paddleserving.slack.com/archives/CUBPKHKMJ)