Add note to readme

README.md

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+> [!NOTE]
+> Sadly, this repository is no longer able to be actively maintained. If you would like to take over the repo please 
+> feel free to get in touch. 
+
 # <img src="https://cloud.githubusercontent.com/assets/460060/8159821/b8bfeb32-136a-11e5-83ed-83b7fe01df3a.jpg" width="30" height="30"> Heimdallr
 
 Heimdallr is an [OAuth 2.0](https://tools.ietf.org/html/rfc6749) client specifically designed for easy usage. It currently supports the [resource owner password credentials grant](https://tools.ietf.org/html/rfc6749#section-4.3) flow, [refreshing an access token](https://tools.ietf.org/html/rfc6749#section-6), as well as [extension grants](https://tools.ietf.org/html/rfc6749#section-4.5).