Description:
Generates concern for the class.
Example:
`rails generate concern User::Authentication` create app/models/user/authentication.rb `rails generate concern admin_controller/localized` create app/controllers/admin_controller/localized.rb
Description:
Generates concern for the class.
Example:
`rails generate concern User::Authentication` create app/models/user/authentication.rb `rails generate concern admin_controller/localized` create app/controllers/admin_controller/localized.rb