Migrate database

Command:
    bundle exec rake db:migrate
Add home controller

Commands:
  rails generate controller home index
  rm public/index.html
  change routes.rb
Add user model

Command:
    rails generate model user name:string
Migrate database

Command:
    rake db:migrate
Install devise

Commands:
  change Gemfile
  bundle install
  rails generate devise:install
Add changes suggested by devise
Add devise to user model

Commands:
  rails generate devise User
  rake db:migrate