install gem userstamp
update schema_plus, so that the arguments will not change
add userstamps(updater_id) to courses
setup models to use userstamp
include userstamp in application controller
so that the User.stamper will automatically set to current_user
update factories because we added updater_id
install gem simple_form
rails generate simple_form:install --bootstrap
rails generate courses controller
default empty actions and routes
new and create action
edit and update action
i18n translation for courses controller