update readme link (#1815)

Co-authored-by: dangleptr <37216992+dangleptr@users.noreply.github.com>

README-CN.md

@@ -52,8 +52,10 @@
 ## 获取帮助
 
 在使用 **Nebula Graph** 过程中遇到任何问题，都可以通过下面的方式寻求帮助：
+
 * [知乎](https://www.zhihu.com/org/nebulagraph/activities)
 * [SegmentFault](https://segmentfault.com/t/nebula)
+* [官方论坛](https://discuss.nebula-graph.io)
 
 ## 文档
 

README.md

@@ -59,7 +59,8 @@ Please note that you must install **Nebula Graph** by [installing source code](h
 In case you encounter any problems playing around **Nebula Graph**, please reach out for help:
 
 * [Slack channel](https://join.slack.com/t/nebulagraph/shared_invite/enQtNjIzMjQ5MzE2OTQ2LTM0MjY0MWFlODg3ZTNjMjg3YWU5ZGY2NDM5MDhmOGU2OWI5ZWZjZDUwNTExMGIxZTk2ZmQxY2Q2MzM1OWJhMmY#)
-* [Stack Overflow](https://stackoverflow.com/search?q=%E2%80%9CNebula+Graph%E2%80%9D&mixed=0)
+* [Stack Overflow](https://stackoverflow.com/search?q=%5Bnebula-graph%5D&mixed=0)
+* [Official Forum](https://discuss.nebula-graph.io)
 
 ## Documentation