[Doc] add introduction page (#452)

README.md

@@ -1,29 +1,29 @@
 <p>
-    <a href="https://github.com/youzan/"><img alt="logo" width="36px" src="https://img.yzcdn.cn/public_files/2017/02/09/e84aa8cbbf7852688c86218c1f3bbf17.png" alt="youzan">
+    <a href="https://github.com/youzan/"><img alt="logo" width="36" height="36" src="https://img.yzcdn.cn/public_files/2017/02/09/e84aa8cbbf7852688c86218c1f3bbf17.png" alt="youzan">
     </a>
 </p>
 <p align="center">
-    <img alt="logo" src="https://img.yzcdn.cn/public_files/2017/12/18/fd78cf6bb5d12e2a119d0576bedfd230.png" width="120" style="margin-bottom: 10px;">
+    <img alt="logo" src="https://img.yzcdn.cn/public_files/2017/12/18/fd78cf6bb5d12e2a119d0576bedfd230.png" width="120" height="120" style="margin-bottom: 10px;">
 </p>
 
 <p align="center">A Vue.js 2.0 Mobile UI at YouZan</p>
 
-[![Build Status](https://travis-ci.org/youzan/vant.svg?branch=master)](https://travis-ci.org/youzan/vant) 
-[![downloads](https://img.shields.io/npm/dt/vant.svg)](https://www.npmjs.com/package/vant) 
+[![Build Status](https://travis-ci.org/youzan/vant.svg?branch=master)](https://travis-ci.org/youzan/vant)
+[![downloads](https://img.shields.io/npm/dt/vant.svg)](https://www.npmjs.com/package/vant)
 [![Coverage Status](https://img.shields.io/codecov/c/github/youzan/vant/dev.svg)](https://codecov.io/github/youzan/vant?branch=dev)
-[![npm version](https://img.shields.io/npm/v/vant.svg?style=flat)](https://www.npmjs.com/package/vant) 
+[![npm version](https://img.shields.io/npm/v/vant.svg?style=flat)](https://www.npmjs.com/package/vant)
 [![license](https://img.shields.io/npm/l/vant.svg)](https://www.npmjs.com/package/vant)
- 
+
 [访问中文版](./README.zh-CN.md)
 
 ## Features
 
-- 45+ Reusable components
-- 90%+ Unit test coverage
-- Extensive documentation and demos
-- Support [babel-plugin-import](https://github.com/ant-design/babel-plugin-import)
-- Support TypeScript
-- Support SSR
+* 48+ Reusable components
+* 90%+ Unit test coverage
+* Extensive documentation and demos
+* Support [babel-plugin-import](https://github.com/ant-design/babel-plugin-import)
+* Support TypeScript
+* Support SSR
 
 <p align="center">
   <img alt="components preview" src="https://img.yzcdn.cn/public_files/2017/12/05/95f5ee7524b7845abb2f51803a01d65e.png">
@@ -34,10 +34,11 @@
 ```shell
 npm i -S vant
 ```
- 
+
 ## Quickstart
 
 #### 1. Use [babel-plugin-import](https://github.com/ant-design/babel-plugin-import) (Recommended)
+
 ```bash
 # Install babel-plugin-import
 npm i babel-plugin-import -D
@@ -65,7 +66,7 @@ import { Button } from 'vant/lib/button';
 import 'vant/lib/vant-css/base.css';
 import 'vant/lib/vant-css/button.css';
 ```
- 
+
 #### 3. Import all components
 
 ```js
@@ -87,25 +88,29 @@ Vue.use(Vant);
 ```
 
 See more in [Quickstart](https://www.youzanyun.com/zanui/vant#/en-US/component/quickstart).
- 
+
 ## Contribution
+
 Please make sure to read the [Contributing Guide](./.github/CONTRIBUTING.md) before making a pull request.
 
 ## Browser Support
+
 Modern browsers and Android 4.0+, iOS 6+.
 
 ## Links
-- [Documentation](https://www.youzanyun.com/zanui/vant)
-- [Changelog](https://www.youzanyun.com/zanui/vant#/en-US/component/changelog)
-- [Weapp UI](https://github.com/youzan/zanui-weapp)
-- [Vant Demo](https://github.com/youzan/vant-demo)
-- [vue-cli-template-vant](https://github.com/youzan/vue-cli-template-vant) 
- 
+
+* [Documentation](https://www.youzanyun.com/zanui/vant)
+* [Changelog](https://www.youzanyun.com/zanui/vant#/en-US/component/changelog)
+* [Weapp UI](https://github.com/youzan/zanui-weapp)
+* [Vant Demo](https://github.com/youzan/vant-demo)
+* [vue-cli-template-vant](https://github.com/youzan/vue-cli-template-vant)
+
 ## Preview
+
 You can scan the following QR code to access the demo：
 
 ![qrcode](https://img.yzcdn.cn/v2/image/youzanyun/zanui/pc/zanui_vue_mobile_preview_03.png)
- 
+
 ## LICENSE
 
 [MIT](https://zh.wikipedia.org/wiki/MIT%E8%A8%B1%E5%8F%AF%E8%AD%89)