update readme

Author: yyx990803

README.md

@@ -1,18 +1,38 @@
-# vue-router
-
-[![Build Status](https://img.shields.io/circleci/project/vuejs/vue-router/master.svg)](https://circleci.com/gh/vuejs/vue-router)
+# vue-router [![Build Status](https://img.shields.io/circleci/project/vuejs/vue-router/master.svg)](https://circleci.com/gh/vuejs/vue-router)
 
 **Compatibility Note:** `vue-router` requires Vue.js 0.12.10+
 
-### Usage
+### Introduction
+
+`vue-router` is the official router for [Vue.js](http://vuejs.org). It deeply integrates with Vue.js core to make building Single Page Applications with Vue.js a breeze. Features include:
 
-Docs incoming. For now please refer to the `/example` folder.
+- Nested route/view mapping
+- Modular, component-based router configuaration
+- Route params, query, wildcards
+- View transition effects powered by Vue.js' transition system
+- Fine-grained navigation control
+- Links with automatic active CSS classes
+- HTML5 history mode or hash mode, with auto-fallback in IE9
+- Restore scroll position when going back in history mode
 
-### Build
+Get started with the [documentation](http://vuejs.github.io/vue-router).
+
+### Development Setup
 
 ``` bash
+# install deps
 npm install
+
+# build dist files
 npm run build
-```
 
-If you want to contribute, help write the tests!
+# serve example app at localhost:8080
+# and unit tests at localhost:8081
+npm run dev
+
+# lint & run unit tests with coverage report
+npm test
+
+# run e2e tests for example app in Chrome & Firefox
+npm run e2e-local
+```