Create the users table

[LaliRabaev]

Create a new users table, think about the way to create/login for users - I guess a Google connection is good, if it's super-hard, a username and password is fine. Find a way to declare myself as Admin. Each user should have a unique user_id that in the future will be added to several tables (such as notes and tasks) to later on display just the relevant tasks/notes/others to the user)

[LaliRabaev]

questions in mind before building the users table:

1. How should I manage accesses (such as admins etc...)?
2. Should I work with username or email?
3. which tables in my db should include the user_id attribute?