Update README.md

README.md

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 - Support multi-user storage space control
 - Support multiple languages
 
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 ## Documentation
 - [English](https://zpan.space)
 - [简体中文](https://zpan.space/#/zh-cn/)
 
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 ## Contributing
 See [CONTRIBUTING](CONTRIBUTING.md) for details on submitting patches and the contribution workflow.
 
@@ -34,3 +39,4 @@ Thank you to all the people who already contributed to ZPan!
 
 ## License
 ZPan is under the GPL 3.0 license. See the [LICENSE](/LICENSE) file for details.
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