Feat: Add initial User Redux state

Background:

Add state management for User login, so we don't need to call firestore everytime to fetch current user's login data.

User scheme is as follows:

export type IUser = {
  id?: string;
  firstName: string;
  lastName: string;
  email: string;
  phone: string;
  pic: string;
};

See Redux state usage here

Added packages:

• redux
• react-redux

How to test:

• Add code from usage example in the link above in a component and run and see if initialState value displays

Tested on:

• iOS
• Android