Add gitter badge

Plus, a friendly line for note about tinylist

README.md

 <a href="http://info.flagcounter.com/T2RV"><img src="http://s09.flagcounter.com/count2/T2RV/bg_FFFFFF/txt_000000/border_CCCCCC/columns_6/maxflags_20/viewers_GFWList/labels_1/pageviews_1/flags_0/percent_0/" border="0"></a>
+
+|[GFWList@Gitter][chat-room]|
+|:---:|
+| [![chat-metadata]][chat-room]|
+
+[chat-metadata]: https://img.shields.io/gitter/room/nwjs/nw.js.svg?style=flat-square "Join the chat"
+[chat-room]: https://gitter.im/gfwlist/gfwlist?utm_source=share-link&utm_medium=link&utm_campaign=share-link "GFWList@Gitter"
+
+:tulip:***For the tiny version of GFWList, please visit [tinylist project homepage](https://github.com/gfwlist/tinylist).***
+******
+
 # gfwlist
 ## The OFFICIAL gfwlist here!