Documentation should detail contents more clearly

[maffettone]

We should at least add a table to the readme of what containers are expected to be spun up, how they interact with each other, and what images they depend on. I can imagine the majority of applications will just execute the bash script and poke around, but a few may want to do some repurposing or extension. Even walking through the compose file, it took a bit of time for me to understand what was getting spun up, and from where.