added user association
user id
added user_id to pins table
added new db/schema
added current_user.pins.build to new action method
used current_user.pins.build in create action in controller
authenticated user
user error message need to sign up
except validation to pins controller
validation for show page as well
only user edit/destroy options diplay for their created pins
private message to prevent nonuser from editiin
edit button only appears if you created that pin