feat : Create firebase setup with emulators for local config

[sohampirale]

Description:

• Configure the Firebase Admin SDK to connect to local emulators when running in development mode. This enables proper local testing by allowing the application to connect to the local Firebase services instead of production, preventing 404 errors when accessing files stored in the local emulator. Adds environment variables for emulator configuration and updates documentation.

Fixes : #8

Screenshots

• Working with emulator : firestore

• Config of other emulators can be added if needed in future