Annotate docker commands in README

Hello Doug! Thanks very much for this library. 

However although I appreciate the Tugboat whimsy I also found it a little confusing. One thing that helped me understand was just annotating the README with docker commands as well. This made things instantly clearer. 

So I wondered if you would consider incorporating this, without losing the whimsy?

I am not quite sure of the "announce your captainship when issuing orders to the crew" one, you may want to check that?

Best wishes!