Update README.md

Added React-DnR component

Author: yongxu

README.md

@@ -441,6 +441,7 @@ A collection of awesome things regarding React ecosystem.
 * [React Joyride - Create walkthroughs, tours and tooltips for your apps](http://gilbarbara.github.io/react-joyride/)
 * [react-file-reader-input - Complete control over styling + abstraction from file reading](https://github.com/ngokevin/react-file-reader-input)
 * [react-sortable-pane - Resizable and sortable pane component for React](https://github.com/bokuweb/react-sortable-pane)
+* [react-DnR - Dragable and Resizable window build with React.js](https://github.com/yongxu/react-DnR)
 
 #### Libraries
 * [react-magic - Automatically AJAXify plain HTML with the power of React](https://github.com/reactjs/react-magic)