Add REUSE compliant badge on README.md

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

README.md

@@ -1,4 +1,4 @@
-[![Support room on Matrix](https://img.shields.io/matrix/matrix-docker-ansible-deploy:devture.com.svg?label=%23matrix-docker-ansible-deploy%3Adevture.com&logo=matrix&style=for-the-badge&server_fqdn=matrix.devture.com)](https://matrix.to/#/#matrix-docker-ansible-deploy:devture.com) [![donate](https://liberapay.com/assets/widgets/donate.svg)](https://liberapay.com/s.pantaleev/donate)
+[![Support room on Matrix](https://img.shields.io/matrix/matrix-docker-ansible-deploy:devture.com.svg?label=%23matrix-docker-ansible-deploy%3Adevture.com&logo=matrix&style=for-the-badge&server_fqdn=matrix.devture.com)](https://matrix.to/#/#matrix-docker-ansible-deploy:devture.com) [![donate](https://liberapay.com/assets/widgets/donate.svg)](https://liberapay.com/s.pantaleev/donate) [![REUSE status](https://api.reuse.software/badge/github.com/spantaleev/matrix-docker-ansible-deploy)](https://api.reuse.software/info/github.com/spantaleev/matrix-docker-ansible-deploy)
 
 # Matrix (An open network for secure, decentralized communication) server setup using Ansible and Docker