adds gems to Gemfile
adds 'people.sql' containing SQL commands for creating database and tables, 'config.rb' to connect to database and  3 models 'person.rb', 'country.rb', 'group.rb'
adds folders and views for the 3 models person, country and group
adds views index.erb and nav.erb, app.rb loads models, config and defines route to index
adds the routes
adds views for people
adds views for countries and groups
updates countries and groups show view to display people too