docs: link to DDEV installation guide (#4710)

Author: Sven Reichel

docs/content/developers/tools/ddev.md

@@ -8,6 +8,8 @@ tags:
 [DDEV](https://ddev.com) is a powerful tool to set up and manage local PHP development environments.
 It is a Docker-based wrapper that provides many useful features for developers out of the box.
 
+To install OpenMage in seconds, follow the DDEV [installation guide](https://ddev.readthedocs.io/en/stable/users/quickstart/#openmage).
+
 !!! info "Docker only"
     For development environment without dependencies aside from Docker, see the
     [Docker Compose](/developers/tools/oneline) guide.