Generate StaticPages, home and help
Create spec
Add spec for Home page
modify helper.rb
Modify home.html.erb
Add 'minitest'\n\n\nテストでWarningが出たので、追加
Add spec for help page
Modify help page.
Add spec for About page
Modify routes.rb
Add about method
Add about.html.erb
Add specs for title
Add title to views
Modify erb
Modify layout file
Modify views