readme : add Msty to UI list (#5618)

Author: ashokgelal

README.md

@@ -155,6 +155,7 @@ Unless otherwise noted these projects are open-source with permissive licensing:
 - [semperai/amica](https://github.com/semperai/amica)
 - [withcatai/catai](https://github.com/withcatai/catai)
 - [Mobile-Artificial-Intelligence/maid](https://github.com/Mobile-Artificial-Intelligence/maid) (MIT)
+- [Msty](https://msty.app) (proprietary)
 
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