update readme

Author: jiangxy

README.md

@@ -1,3 +1,31 @@
 # websocket debug tool
 
 A tool to debug websocket/sockjs/stomp.
+
+![](screenshot.png)
+
+# Features
+
+* support WebSocket/[SockJS](https://github.com/sockjs/sockjs-client), with or without [STOMP](https://github.com/jmesnil/stomp-websocket)
+* React + ES6 + webpack + [Ant Design](https://github.com/ant-design/ant-design)
+
+# Quick Start
+
+Open [http://jiangxy.github.io/websocket-debug-tool](http://jiangxy.github.io/websocket-debug-tool) and use directly.
+
+If you wanna modify the source code:
+
+1. node 5.3, npm 3.3+
+2. `git clone` and `npm install`
+3. `npm run dev` to start webpack-dev-server
+4. open `http://localhost:4040`
+
+# Spring-based server
+
+There is a spring-based WebSocket server in the [java](java) folder for test. View [Doc](java/README.md).
+
+# Browsers support
+
+| [<img src="https://raw.githubusercontent.com/godban/browsers-support-badges/master/src/images/chrome.png" alt="Chrome" width="16px" height="16px" />](http://godban.github.io/browsers-support-badges/)</br>Chrome |
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+| last 2 versions