Add a database to golang service to hold users data

[DiptoChakrabarty]

Currently wt token and login endpoint only takes in a username and it is not stored anywhere.

It would be good if a database is present under which the authentication service can work on , users are stored in database and validated from the data present there.

So the flow would be

• user registers themselves in new endpoint
• their data is stored in database
• on logging in from login endpoint values are validated from database and jwt token is provided