Create login view
Define the login route
Add two actions, login_form and login_success
Get two parameters, username and password, in the login_success form
Modify routes after success in login action
Add therubyracer
Add a table to store user's id and password
Add a attribute named count in the table Member
Validate the length of username and password
Add a signup view file
Add a signup action in the home controller
Modify signup action in home controller
Add list action which shows the list of members
Add /home url in the routes