protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
fireBaseManager = FireBaseManager.GetInstance();
fireBaseManager.InitializeFireBase(Application.Context);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.Main);
// Get our button from the layout resource,
// and attach an event to it
Button btnEmail = FindViewById <Button>(Resource.Id.btnEmail);
Button btnGoogle = FindViewById <Button>(Resource.Id.btnGoogle);
btnEmail.Click += BtnEmail_Click;
btnGoogle.Click += BtnGoogle_Click;
ConfigureGoogleSignIn();
}