Update maintainers-guestbook.md (#254)

Author: Izuchii

docs/becoming-a-maintainer/maintainers-guestbook.md

@@ -17,3 +17,4 @@ Congratulations on finishing the Becoming a Maintainer Course with OpenSauced. W
 - [Virtual Coffee](https://github.com/virtual-Coffee/virtualcoffee.io/) by [VirtualCoffee](https://github.com/virtual-Coffee/)
 - [Postpartum Wellness App](https://github.com/BekahHW/postpartum-wellness-app) by [BekahHW](https://github.com/BekahHW/)
 - [Idrinth API Bench](https://github.com/idrinth-api-bench/issues) by [Idrinth](https://github.com/Idrinth/)
+- [Favorite Open Source Resources](https://github.com/Izuchii/favorite-open-source-resources) by [Izuchii](https://github.com/Izuchii/)