Add a .rubocop.yml.
Add a .rubocop.yml.

Prefer formatting strings with %, since it's shorter and no less obvious
than the alternatives.

Signed-off-by: brian m. carlson <738bdd359be778fee9f0fc4e2934ad72f436ceda@crustytoothpaste.net>

bk2204/generation-comics,bk2204/generation-comics