Implement 2FA in API

[luisced]

Implement 2 factor auth inside the API login process

Features

1. Each time a user logins for first time, a 6 digit code must be sent via e-mail.
2. There must be a function called send2FAmail that sends an hmtl-css template with the following info:
   • Name
   • LastName
   • Message that greet the user
   • 6 digit auth number

This feature must be implemented inside login function

FIles: login.utils inside extractUP4UContent, line: 38