Update ReadMe.md

Author: awaescher

ReadMe.md

@@ -2,6 +2,8 @@
 
 This is an experimental approach to bring the macOS [Stage Manager](https://support.apple.com/en-us/HT213315) to Microsoft Windows.
 
+> **Important:** This is a prototype and a feasibility study - I am not actively developing this project at the moment but I'd be happy to review and merge pull requests. 
+
 ![Stage Manager](media/StageManager%20Basics.gif)
 
 This prototype groups applications by their process. By switching between so called "scenes" on the left, Stage Manager hides other windows and the desktop icons, helping you to focus.