Use generate to create 'Users' controller with 'new' action (this creates 1. controller and 2. view/template.  Add route to new page using 'match' -- instead of routing to /new, routes to /signup -- (Did: match '/signup', to: 'users_controller#new', via: 'get').  Update html in new.html.erb.
Create new rspec testing page, user_pages_spec.rb (for all 'users' tests going forward).  Add 2 tests, for signup page.
Update signup link to signup_path (from stub '#').
Ch5 complete