(Feat) Classroom Management

[shatanikmahanty]

This is the umbrella issue for managing issues related to classroom management.

The general idea is to create an infrastructure to let users create classroom and then let users join them through unique code or invite based system. We will be relying on Firebase Firestore as a backend.

Issues under this:

• Ability to create classroom (New features to be updated soon) #8
• Ability to join classroom #9
• Ability to view my classrooms (Using a dashboard maybe) #14
• Ability to view participants #13
• Ability to upload files for instructor
• Ability to manage assignments (Need to review the best possible solution that is cost effective and robust at the same time, as using Firebase Cloud Storage will end up racking huge cost for us)
• Security rules for Firebase Firestore
• Notification integration (Using topics maybe)

UI will be shared on request basis based on assignee