Flesh out README a bit.

README.md

@@ -10,6 +10,14 @@ A functioning docker install - locally or remotely.
 docker build -t omnibus-docker
 ```
 
-## Create container
+## Create Container
 
+```bash
 docker run -ti --rm -e EDITION=ce VERSION=9.1.2 omnibus-docker
+```
+
+## Create Container With Local Omnibus
+
+TODO
+
+Also use this to build an omnibus package?