Add column Admin to User
Add column Firstname, Lastname for User and validations for presence
Add permit parameters for User-devise
Routes for devise update
Add fields firstname, lastname to new,update Devise-views
Add navbar buttons for devise User and notice, alert in aplication layout
Admin check add for Categories
Add validations for Product and method average_rating
Add validation uniq name for Category(case_sensitive:true)
Add validations for reviews
Add user auth to ProductController
Add check for owner of product in ProductController
Add method author to ReviewDecorator