Update 'README.md'

Add link to Liberapay

README.md

@@ -32,6 +32,11 @@ If you find any bugs (that is broken, existing features) please open an issue he
 
 You can also join #tinge on irc.libera.chat or use the [kiwiirc webchat](https://kiwiirc.com/nextclient/irc.libera.chat/#tinge) to ask any questions.
 
+## Donations
+[![Donate using Liberapay](https://liberapay.com/assets/widgets/donate.svg)](https://liberapay.com/micke/donate)
+
+If you want, you can chip in for server costs on [Liberapay](https://liberapay.com/micke/donate).
+
 ## Screenshots
 ![Discover Bridge View](https://code.smolnet.org/micke/tinge/raw/branch/master/screenshots/scrot1.png)
 ![All Bridge View](https://code.smolnet.org/micke/tinge/raw/branch/master/screenshots/scrot2.png)