You'll need Postgres and Redis, which are available with a brew install.
To install all the dependencies, run:
bundle install
Next the app requires some env vars for configuration. A sample .env.sample is provided for running the app locally. You can copy .env.sample to .env which foreman will pick up.
Using foreman we can boot the application.
$ foreman start
You can now visit http://localhost:5000 to see the application.