First install the boxcar gem (eventually, we'll have it published on rubygems, but there's some naming conflicts at the moment):
git clone email@example.com:smashingboxes/boxcar.git cd boxcar bundle install
bin/boxcar new path/to/project_name
Don't forget to replace
path/to/project_name with the actual path. For example, if you want to
make a hello world app, you might run
bin/boxcar new ~/repos/hello-world.
If you'd like to contribute to Boxcar, please see CONTRIBUTING.md.