chore: README.md

Author: RambokDev

README.md

@@ -18,6 +18,7 @@
 [![PostgreSQL](https://img.shields.io/badge/PostgreSQL-336791?logo=postgresql&logoColor=white)](https://www.postgresql.org/)
 [![MySQL](https://img.shields.io/badge/MySQL-4479A1?logo=mysql&logoColor=white)](https://www.mysql.com/)
 [![MariaDB](https://img.shields.io/badge/MariaDB-003545?logo=mariadb&logoColor=white)](https://mariadb.org/)
+[![MongoDB](https://img.shields.io/badge/-MongoDB-13aa52?logo=mongodb&logoColor=white)](https://www.mongodb.com/)
 [![Self Hosted](https://img.shields.io/badge/self--hosted-yes-brightgreen)](https://github.com/Portabase/portabase)
 [![Open Source](https://img.shields.io/badge/open%20source-❤️-red)](https://github.com/Portabase/portabase)