Add Authentication.

[SubhashMalireddy]

• [ ] Understand how the tutorial is storing the auth details in the app.
• [ ] Understand the Authentication design patterns in Next.js in order to write the above logic in this Next app.
• [ ] When reading the tutorial in the first point you should be able to decide weather to use the apollo-client or not to manage the auth-state.
• [ ] See if the traditional approach that you(me<-Subhash) used in one of the projects suits better.