Add opensuse to list (#116)

Reviewed-on: https://gitea.com/gitea/awesome-gitea/pulls/116
Reviewed-by: delvh <dev.lh@web.de>
Reviewed-by: John Olheiser <john+gitea@jolheiser.com>
Co-authored-by: techknowlogick <techknowlogick@noreply.gitea.com>
Co-committed-by: techknowlogick <techknowlogick@noreply.gitea.com>

README.md

@@ -107,6 +107,7 @@ A curated list of awesome projects related to Gitea.
 ### For internal use
 
 - [FSFE](https://git.fsfe.org/) - Git @ Free Software Foundation Europe
+- [openSUSE](https://gitea.opensuse.org/) - openSUSE Gitea
 - [PSES](https://git.passageenseine.fr/pses) - Git @ Pas Sage en Seine.
 - [Sum7](https://dev.sum7.eu/) - A hoster to support decentralized services. A step away from big cloud services.
 - [Teknik](https://git.teknik.io/Teknikode) - Provide services to help those who try to innovate.