Update README.md

Author: apman

README.md

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 Custom Avalonia Themes developed by [Devolutions](https://devolutions.net/)
 
 ➡️ [MacOS Theme](https://github.com/Devolutions/avalonia-themes/blob/master/src/Devolutions.Avalonia.Theme.MacOS/README.md)
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 ➡️ [DevExpress Theme](https://github.com/Devolutions/avalonia-themes/blob/master/src/Devolutions.Avalonia.Theme.DevExpress/README.md)