docs: updated donate section

README.md

@@ -47,6 +47,14 @@ It is highly recommended to use the 1.x version until a stable version of 2.0 is
 - [Special Thanks](#special-thanks)
 - [Contribute](#contributors)
 
+<h2 align="center">Donate</h2>
+
+Wiki.js is an open source project that has been made possible due to the generous contributions by community backers. If you are interested in supporting this project, please consider [becoming a patron](https://www.patreon.com/requarks) or donating to our [OpenCollective](https://opencollective.com/wikijs).
+
+<a href="https://www.patreon.com/requarks">
+  <img src="https://c5.patreon.com/external/logo/become_a_patron_button.png" alt="Become a Patron" />
+</a>
+
 <h2 align="center">Requirements</h2>
 
 Wiki.js can run on virtually all platforms where Node.js can (Windows, Mac, Linux, etc.) or using Docker!