Test1 - chap 1: test

{ "apiKey": "AIzaSyDb0Gyn3BZgCM7VayMpr65GUA77O7Zy1Qo", "authDomain": "tinhtrainhaai-ttna.firebaseapp.com", "databaseURL": "https://tinhtrainhaai-ttna-default-rtdb.asia-southeast1.firebasedatabase.app", "projectId": "tinhtrainhaai-ttna", "storageBucket": "tinhtrainhaai-ttna.appspot.com", "messagingSenderId": "1056080462558", "appId": "1:1056080462558:web:968f4242aed5716669784f", "measurementId": "G-NRJYGPSGPY" }