Add nlnet grant line in readme.

README.md

@@ -121,6 +121,8 @@ Each Lemmy server can set its own moderation policy; appointing site-wide admins
 
 Lemmy is free, open-source software, meaning no advertising, monetizing, or venture capital, ever. Your donations directly support full-time development of the project.
 
+Lemmy is made possible by a generous grant from the [NLnet foundation](https://nlnet.nl/).
+
 - [Support on Liberapay](https://liberapay.com/Lemmy).
 - [Support on Patreon](https://www.patreon.com/dessalines).
 - [Support on OpenCollective](https://opencollective.com/lemmy).