Set up flask authentication routes

[CodeWithTheDoctor]

Authentication

Registering new user

• [x] Create api route for registering users (unless authentication is handled in some different way in flask)
• [x] Check if user exists in database already or not
• [x] Validate user password

Sign-up

• [x] Create api route for signing up users (again, unless authentication is handled differently by flask)
• [x] Check if user exists or not
• [x] Authenticate the user.

[innoc3ntt]

mostly done, needs checking