Create User model
rake db:migrate
Create UsersController
Create controller spec for signup users. Set up so that can use factory girl methods
Create factories.rb
Add create user form. bundle install pry, database_cleaner. Set up so that can use database_cleaner
Create views shared/error
Improve views users/form and hames/index
Merge pull request #2 from ahkr/feature/user_signup

サインアップ機能を実装