Update README.md (#15)

Author: wu-sheng

README.md

@@ -52,5 +52,11 @@ Library | Plugin Name
 | [`express`](https://expressjs.com) | `express` |
 | [`axios`](https://github.com/axios/axios) | `axios` |
 
+## Contact Us
+* Submit [an issue](https://github.com/apache/skywalking/issues/new) by using [Nodejs] as title prefix.
+* Mail list: **[email protected]**. Mail to `[email protected]`, follow the reply to subscribe the mail list.
+* Join `skywalking` channel at [Apache Slack](http://s.apache.org/slack-invite). If the link is not working, find the latest one at [Apache INFRA WIKI](https://cwiki.apache.org/confluence/display/INFRA/Slack+Guest+Invites).
+* Twitter, [ASFSkyWalking](https://twitter.com/ASFSkyWalking)
+
 ## License
 Apache 2.0