Create the sign in flow

[krharsh17]

Google authentication using Firebase has to be implemented on the index page.

Task

The page currently contains a text and a button. These will be updated later when their designs are ready. For now, implement the sign in flow for Google Authentication using Firebase.

Important
Only a select group of users should be allowed access into the portal. Implement this with Custom Claims Here is more on it - https://firebase.google.com/docs/auth/admin/custom-claims & https://firebase.google.com/docs/database/security/user-security

Upon successful authentication, the user should be directed to the Home page. Also, if the user was pre-authenticated, ie a user was already logged in, you need to forward him directly to Home page.

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