add README

README.md

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+#dragresize
+--
+A ReactJS component to render a dragresize layer.
+###Installation
+-----
+Install dragresize with [npm](https://www.npmjs.com/):
+
+```
+$ npm install dragresize --save
+```
+
+For [CommonJS](http://wiki.commonjs.org/wiki/CommonJS) users:
+
+```javascript
+import Dragresize from 'dragresize';
+```
+
+###Example
+-----
+
+npm install;
+
+npm start;
+
+###Props
+-----
+
+| Name | Type | default | Description |
+| --- | --- | --- | --- |
+| `elmX` | `Number` | `10` | **Required.** The layer X axis. |
+| `elmY` | `Number` | `10` | **Required.** The layer Y axis. |
+| `elmW` | `Number` | `100` | **Required.** The layer width. |
+| `elmH` | `Number ` | `150` | **Required.** The layer height. |
+| `isDrag` | `Boolean` | `true` | 是否可拖拽. |
+| `isResize` | `Boolean ` | `true` | 是否可缩放. |
+| `isRatio` | `Boolean ` | `false` | 是否按比例缩放. |
+| `isChecked` | `Boolean ` | `true` | 是否选择. |
+| `minLeft` | `Number` | `null` | Drag Scope |
+| `minTop` | `Number` | `null` | Drag Scope |
+| `maxLeft` | `Number ` | `null` | Drag Scope |
+| `maxTop` | `Number ` | `null` | Drag Scope |
+| `minWidth` | `Number ` | `10` | Resize Scope |
+| `minHeight` | `Number ` | `10` | Resize Scope |
+| `maxWidth` | `Number ` | `null` | Resize Scope |
+| `maxHeight` | `Number ` | `null` | Resize Scope |
+| `onMouseDown ` | `Function` | `null` | MouseDown Callback |
+| `onMouseMove` | `Function ` | `null` | MouseMove Callback |
+| `onResize` | `Function ` | `null` | Resize Callback |