add some gems
create video model and seed data
testing video model using shoulda-matchers
build the home page
build the video show page
create category model and seed data
testing category and associations
build the category page
implement `search_by_title` on the video model
implement search on the UI
implement `recent_videos` method on the category model
show only recent videos on the UI
build the front page
implement register and sign in page
implement sign out and authentication