BE: Setup Postgres / Mongo for project

[dproc96]

- Set up the selected database for the project. The goal for this ticket is that the authentication features included in the starting code will be functional by storing user information in the database.

Here are some resources on the technologies:
- **Postgres** - use SQLAlchemy if you are using Flask/Python and use Sequelize if you are using Node.js/Express
- **MongoDB** - use Mongoose for Node.js or PyMongo + some object document mapper to make things organized

[christian-barnabe-chabi]

Task done! Link shared on our Slack channel