Create README.zh-CN.md

Author: internet5

README.zh-CN.md

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+# smart-array-to-tree
+[![Build Status](https://travis-ci.org/internet5/smart-array-to-tree.svg?branch=master)](https://travis-ci.org/internet5/smart-array-to-tree)<br />
+快速地转换数据量比较大的数组为树结构，转换数组长度为46086的组数时，只花了大约0.1秒的时间，而其他转换工具对于这个数据量要么就是转换不正确，要么就是直接挂掉
+# 安装 && 用法
+
+在node中:
+```shell
+$ npm i smart-arraytotree --save
+```
+```javascript
+var smartArrayToTree = require('../index.js');
+var fetch = require('node-fetch');
+//get test data length 46086
+fetch('https://raw.githubusercontent.com/internet5/smart-array-to-tree/master/example/data.json').then(function(response) {
+  return response.json();
+}).then(function(data) {
+  //start time
+  console.log(new Date());
+  //transform
+  let tree = smartArrayToTree(data, { id:'regionId', pid:'parentId', firstPid:null });
+  //end time
+  console.log(new Date());
+}).catch(function(e) {
+  console.log(e);
+});
+/*console*/
+//2017-11-21T09:51:37.930Z
+//2017-11-21T09:51:37.979Z
+ ```
+
+在浏览器中:
+```html
+<script src="smartArrayToTree.js"></script>
+```
+```html
+<script src="http://code.jquery.com/jquery-2.2.4.min.js" integrity="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44="
+    crossorigin="anonymous"></script>
+  <script src="smartArrayToTree.js"></script>
+  <script>
+    window.onload = function () {
+      $.getJSON("https://raw.githubusercontent.com/internet5/smart-array-to-tree/master/example/data.json", function (data) {
+        console.log(new Date());
+        var tree = smartArrayToTree(data, { id: 'regionId', pid: 'parentId', firstPid: null });
+        console.log(new Date());
+        console.log(tree)
+      });
+    }
+  </script>
+```
+## API
+### `smartArrayToTree(data, [options])`
+
+#### 参数
+- **Array** `data`: 数组数据
+- **Object** `options`: 包含下列属性的配置对象:
+  - `id` (String): 数据的ID属性名称. 默认值: 'id'
+  - `pid` (String): 数据的父ID属性名称. 默认值: 'pid'
+  - `children` (String): 返回树结构对象中子节点属性名称. 默认值: 'children'
+  - `firstPid` (String): 将作为树结构顶层节点的父节点值 . 默认值: null
+
+#### 返回
+- **Array**: 返回转换后的树结构数据