Add donation option

README.md

@@ -23,6 +23,14 @@ hugo server --watch=true -D
 - Create a PR and ask the Hypriot Team for review
 
 
+Buy us a beer!
+------------------------
+
+This FLOSS software is funded by donations only. Please support us to maintain and further improve it!
+
+<a href="https://liberapay.com/Hypriot/donate"><img alt="Donate using Liberapay" src="https://liberapay.com/assets/widgets/donate.svg"></a>
+
+
 License
 --------
 <img src="http://www.creativecommons.ch/wp-content/uploads/2014/03/by-nc1.png" width="88" height="31" />