Updated readme

README.md

@@ -4,4 +4,9 @@ This is a *very* simple docker container for the
 [mdzk](https://github.com/mdzk-rs/mdzk) zettelkasten publishing framework.
 Created because reinstalling using docker for every automated build was too
 costly.  You can find it on
-[DockerHub](https://hub.docker.com/repository/docker/fr1nge/mdzk/)
+[DockerHub](https://hub.docker.com/repository/docker/fr1nge/mdzk/).
+To serve a zettelkasten on port 8080, the command is:
+
+```
+docker run -p 3000:8080 -v ./zettelkasten:/wiki fr1nge/mdzk:latest
+```