Have a fully created app as reference

I think it would be useful to have a completely set up project from scratch using `create-choo-app` included in this repo as a reference. Sometimes, I want to see what a conventionally set up choo app would look like, and cherry pick some features that would make sense for me. I think this is most applicable to an existing project.

No files, tests, or entry points are named. Start by inspecting the repository and the output of create-choo-app, then determine the expected contents of a conventionally set-up reference project; done means a complete example is included and usable for comparison.

Written by the indexing model from the issue text.