improved readme

Author: donid

README.md

@@ -9,7 +9,9 @@ It was created for portable devices with a touch screen that have an unreliable
 rotation / orientation sensor which can be quite annoying. To activate it, just touch
 (left-click) the icon and the choose the rotation angle.
 
-QuickRotate does not require any installation / setup - just run the .exe
+QuickRotate does not require any installation / setup (but it requires the .Net 6 Runtime) - just run the .exe
 
 This project also provides the class library *RotateDisplayLib* which can be used in
 PowerShell scripts or in your own .Net application.
+
+[![.NET](https://github.com/donid/QuickRotate/actions/workflows/dotnet.yml/badge.svg)](https://github.com/donid/QuickRotate/actions/workflows/dotnet.yml)