Add a Gitter chat badge to README.md
@@ -1,5 +1,7 @@
# Project V2Ray
+[](https://gitter.im/v2ray/v2ray-core?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
[](https://travis-ci.org/v2ray/v2ray-core)
[](https://coveralls.io/github/v2ray/v2ray-core?branch=master)
[](https://godoc.org/github.com/v2ray/v2ray-core)