I want to run the Flutterfire_master sample code on Android Studio.

https://github.com/FirebaseExtended/FlutterFire

Download the sample code folder (flutterfire-master) on the above page and
I'm trying to get it done, but I don't know how to do it.

As a trial,
flutterfire-master>packages>firebase_auth
I am trying to run the sample in androidstudio.
This is a sample of firebase, so I think I will register the application in the firebase project.
Before that, I don't know which files and how to open them on Android Studio.
Please tell me how to open it.