Made title and youtube link fields required in new video form (new.erb). Gave show.erb slightly better formatting.
Removed showing and adding summary field (will not be used). AR is not requiring summary fields, remains as a column in the DB
Added backend logic for comments (model\table created), comments are disabled if exists on show page. Future task is to add comments to the front end (ability to add\edit).
Created playlist and playlist_video models. Created empty playlist controller