[AUTH] - Register a new user with email and password

[Andy Allison]

Overview

Allow a new user to be registered with their details and a valid email.

Criteria

Scenario 1 - Register a new user

• A user provides a valid email, first and last name and a password
• The system adds the user to the database and stores an encrypted version of the password.
• The API returns a success status

Scenario 2 - Register with an existing email

• A user provides details that include an already existing email
• There should be no details saved in the database
• The API should return a bad request status