relates to #291

Hi!

Here is guide how to install and use firebase emulator:

• Install Firebase Tools: npm install -g firebase-tools.
• Initialize Firebase in your project: firebase init.
• Select Firestore, Authentication, and Storage during the initialization process.
• Install Java version 11 or higher (if you are using MacOS) - visit https://adoptium.net/ for installation.
• Add firebase.json to your project directory and security rules.
• To start the emulator, use the command: firebase emulators:start. It will run on http://localhost:4000/.
• To start the project locally, use: npm run start:dev. If you don’t have environment files, you can still test and create data in the emulator.

I have already added firebase emulator, but there are a lot of emulator files after executing run from cli. Maybe we need to hide it in gitignore ?