Add wallet public ID to README.

README.md

@@ -4,6 +4,11 @@
 Invidition is a small extension allowing you to redirect YouTube requests to Invidious before loading them.
 Invidition has for purpose to make 0 call to YouTube. If you see any call to YouTube/Google servers being made, feel free to fill an issue.
 
+If you like this extension, you can make a donation with the libre currency Ğ1. I don't plan to open donations for any other currency for now.
+[Learn more about Ğ1](https://duniter.org/en/introduction/).
+
+Here is my wallet public ID: `C4D3ykicaK5YDs9yTGEURnihCRfVxa36BAhRe2MEG8yq`
+
 ## Downloads
 ### Firefox
 You can download it for Firefox here: https://addons.mozilla.org/firefox/addon/invidition