ChatApp - Backend

Backend of a 4th semester exam project for Computer Science program at Business Academy Southwest.

Implemented user stories:

As a user I want to be able to register in the application.
As a user I want to be able to log in to the application. (Disregard security, just make a simple request to the database for matches)
As a user I want to be able to search through all other users.
As a user I want to be able to send friend requests to other users.
As a user I want push notifications when a friend request is send to me.
As a user I want to be able to create chat rooms.
As a user I want to be able to join my own/friends chat rooms.
As a user I want to be able emit chat messages inside of joined rooms.
As a user I want to instantly receive chats emitted by other users in the room I'm currently in.
As a user I want to see if another user in the same room is typing a message.