[Feature] Update Drag&Drop Readme

README-ZH.md

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-UIWidgets也可以在EditorWindow上以及在游戏进程非运行状态下运行，因此我们可以使用它来编绘实用且美观的小组件来拓展编辑器。
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 我们提供了一个包装好的`UnityObjectDetector`组件以及`onRelease`回调函数，借此您可以实现简单地将物体（例如Hierarchy内的场景物体、Project窗口下的文件等）拖拽至区域内，来获得`UnityEngine.Object[] `类型的引用并进行操作。
 
 你可以在“UIWidgetsTests -> Drag&Drop”下找到简单的实例样例。

README.md

   <img src="https://connect-prd-cdn.unity.com/20190718/p/images/e3c9cf9b-c732-4eb2-9afd-fe7de894f342_Custom_Inspector_Showcase_320px.gif" width="300"/>
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-UIWidgets can also be run on the EditorWindow without playing the runtime mode, thus, we can build some useful and pretty widgets to expand the editor. 
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 With the provided packaged stateful widget `UnityObjectDetector` and its `onRelease` callback function, you can easily drag some objects (for example GameObject from Hierarchy, files from Project Window, etc) into the area, get the UnityEngine.Object[] references and make further modification.
 
 Please refer to "UIWidgetsTests -> Drag&Drop" for simple examples.