Create User model
Remove .gitignore and Gemfile.lock from being tracked
Build out User spec test
Add validation to User
Add email validation to User
Add length validation to User.name
Add email regex validation to User
Add email uniqueness validation to User
Add downcase to User.email.  Add migration for users.email index
Create a migration for adding a password_digest column to the users table.
Add migration files.
Add secure password and related fields
Add authentication to user