Make available or port to .NET Core/6/8

[luislhg]

Hello, are there any plans to migrate this to .NET Core/6/8 ?

[luislhg]

Hey, since I had no response, I created a new repo, ported to .NET Standard (.NET Framework and .NET compatible)

https://github.com/luislhg/XBoxController.Standard
https://www.nuget.org/packages/XBoxController.Standard/

I added credits to this project and BrandonPotter in the README
If you think there's anything wrong or would like me to add/edit anything to credits, license, etc, please just let me know