Chore(docs): update README

README.md

@@ -1,8 +1,18 @@
 # quantum-caddy
 
-A Caddy reverse proxy with s3 storage for certmagic and service discovery via labels
+A Caddy distribution which includes the Caddy reverse proxy `certmagic-s3` (for TLS/SSL certificate storage) and `caddy-docker-proxy` (for service discovery via labels on Docker Swarm/Compose).
 
 Modules/plugins:
 
 * [certmagic-s3](https://github.com/ss098/certmagic-s3)
 * [caddy-docker-proxy](https://github.com/lucaslorentz/caddy-docker-proxy/)
+
+## Images
+
+Images are available and free to use for anyone. To download and use an image:
+
+```sh
+$ docker pull r.planetary-quantum.com/quantum-public/hostwithquantum/quantum-caddy@TAG
+```
+
+> Note: The docker tags match release tags in this repository.