Updated Documentation

Author: jeffreylanters

README.md

@@ -18,7 +18,7 @@ When building content for the web, you might need to communicate with elements o
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 [**Documentation**](#documentation) ·
 [**Test Environment**](https://github.com/jeffreylanters/react-unity-webgl-test) ·
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+[**Buy me a Coffee**](https://github.com/sponsors/jeffreylanters) ·
 [**Discussion Board**](https://github.com/jeffreylanters/react-unity-webgl/discussions)
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