django:startapp, django:model, with documentation and tests

Two commands to 1. create a django app (in apps folder as per your structure) and 2. create a model in the app with help selecting fields and their options.

App creation command also calls the model creation command (any number of time)

Tests are available.

Documentation is in the committed README.md

I hope this is of interest to this project. Comments and changes are very welcome.