Sample chat app using firebase realtime database.
Visit this site for firebase configuration help https://firebase.google.com/docs/android/setup?authuser=0
Step 1: Create a Firebase project
Step 2: Register your app with Firebase
1.Go to the Firebase console.
2.In the center of the project overview page, click the Android icon (plat_android) to launch the setup workflow.
3.If you've already added an app to your Firebase project, click Add app to display the platform options.
4.Enter your app's package name in the Android package name field.
5.(Optional) Enter other app information: App nickname and Debug signing certificate SHA-1.
6.How are the App nickname and the Debug signing certificate SHA-1 used within Firebase?
7.Click Register app.
Step 3: Add a Firebase configuration file
1.Add the Firebase Android configuration file to your app:
2.Click Download google-services.json to obtain your Firebase Android config file (google-services.json).
3.Move your config file into the module (app-level) directory of your app.
