Description:

Generates a new controller and its views. Pass the controller name, either
CamelCased or under_scored, and a list of actions as arguments.

To create a controller within a module, specify the controller name as a
path like 'parent_module/controller_name'.

This generates a controller class in app/controllers and invokes helper,
template engine, assets, and test framework generators.

Examples:

`bin/rails generate controller credit_cards open debit credit close`

This generates a `CreditCardsController` with routes like /credit_cards/debit.
    Controller: app/controllers/credit_cards_controller.rb
    Test:       test/controllers/credit_cards_controller_test.rb
    Views:      app/views/credit_cards/debit.html.erb [...]
    Helper:     app/helpers/credit_cards_helper.rb

`bin/rails generate controller users index --skip-routes`

This generates a `UsersController` with an index action and no routes.

`bin/rails generate controller admin/dashboard --parent=admin_controller`

This generates a `Admin::DashboardController` with an `AdminController` parent class.