[FEATURE] Add User DB

[DMalone87]

Is your feature request related to a problem? Please describe.
Currently, we're lacking a user object that can be used for authentication.

Describe the solution you'd like
We need to add the required DB objects to handle user authentication. A good solution will cover all of the different user types:

• A basic user who has only provided an email address and other optional profile information
• A Passport user who has provided some additional information and must be approved by an administrator
• A Contributor user who has permission to update and add records to the index
• An Admin user