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How our project will looks like? Here we go 
Step 1:
Create a project and add dependencies in Android Studio.
dependencies { implementation 'com.google.firebase:firebase-core:16.0.8' implementation 'com.google.firebase:firebase-messaging:17.4.0' implementation 'com.google.firebase:firebase-database:16.1.0' implementation 'com.google.firebase:firebase-auth:16.2.0' implementation 'com.github.joielechong:countrycodepicker:2.1.8' implementation 'com.github.GoodieBag:Pinview:v1.3' }