To analyse how to handle user information and persit it

[as-ajitsingh]

• [x] To check on how user can be stored on firebase db
• [x] if we store token then if user logs back in how to recognise same user.
• [x] Is the id given by firebase is always same for same user?
• [x] To check if the firebase db rules are enough or we need lambda functions to store and retrieve comments ?