Update README.md

Author: KevenYoung

README.md

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 README: [English](https://github.com/Coding/WebIDE/blob/master/README.md) | [中文](https://github.com/Coding/WebIDE/blob/master/README-zh.md)
 
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+### WebIDE is now upgraded to Cloud Studio，welcome to our new homepage https://studio.coding.net/
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+
 ![](https://raw.githubusercontent.com/Coding/WebIDE/gh-pages/screenshots/import.png)
 
 ![](https://raw.githubusercontent.com/Coding/WebIDE/gh-pages/screenshots/workspace.png)