add Patreon note
MODIFY
README.md
README.md
A netstandard package to copy text to and from the clipboard.
+**This project is supported by the community via [Patreon sponsorship](https://www.patreon.com/join/simoncropp). If you are using this project to deliver business value or build commercial software it is expected that you will provide support [via Patreon](https://www.patreon.com/join/simoncropp). If you do not feel this project is worth supporting, to ensure its long term existence, perhaps you should find an alternative tool or build the functionality yourself.**
+
## NuGet [![NuGet Status](http://img.shields.io/nuget/v/TextCopy.svg?style=flat)](https://www.nuget.org/packages/TextCopy/)

add Patreon note