Update README.md

README.md

+# RT-Thread #
 
+[中文页](README_zh.md) |
+
+[![GitHub](https://img.shields.io/github/license/RT-Thread/rt-thread.svg)](https://github.com/RT-Thread/rt-thread/blob/master/LICENSE)
+[![GitHub release](https://img.shields.io/github/release/RT-Thread/rt-thread.svg)](https://github.com/RT-Thread/rt-thread/releases)
+[![Build Status](https://travis-ci.org/RT-Thread/rt-thread.svg)](https://travis-ci.org/RT-Thread/rt-thread)
+[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/RT-Thread/rt-thread?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[![GitHub pull-requests](https://img.shields.io/github/issues-pr/RT-Thread/rt-thread.svg)](https://github.com/RT-Thread/rt-thread/pulls)
+[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat)](https://github.com/RT-Thread/rt-thread/pulls)
 
 # Introduction