Update README.md

Author: a7ul

README.md

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 # React NodeGui
 
+⚠️ React NodeGui is no longer maintained. Please fork it to continue development ⚠️ 
+<br/>
+
 [![Join the NodeGUI community on Spectrum](https://withspectrum.github.io/badge/badge.svg)](https://spectrum.chat/nodegui)
 [![All Contributors](https://img.shields.io/badge/all_contributors-7-orange.svg?style=flat-square)](#contributors)