Description:
    Stubs out a new service. Pass the service name, either CamelCased or
    under_scored, and an optional list of attributes as arguments.

    You don't have to think up every attribute up front, but it helps to
    sketch out a few so you can start working with the service immediately.

Examples:
    `rails generate admin:service audits::log`
        create  app/services/audits/base.rb
        create  app/services/audits/log.rb

    `rails generate admin:service Payment amount, user_id`
        create  app/services/payment/base.rb
        create  app/services/payment/item.rb
