Rails test scaffold

This is the starting point for the Pennylane Rails live-coding interview.

Before the interview, please prepare your setup by having:

a recent working ruby (>= 3.3), ruby -v should output the version
having cloned this repo locally
having run bundle install successfully
having run rails db:drop db:create db:migrate db:seed to create the sqlite database

To check everything is working, run rails s and navigate to http://localhost:3000, a table with 50 invoices should be displayed.

In case you're stuck and can't find a solution, please reach out to thierry@pennylane.tech