fix: check for Google Play Services, per Firebase recommendations

See https://firebase.google.com/docs/cloud-messaging/android/client#sample-play for more information

Author: AKPWebDesign

app/src/main/java/tech/akpmakes/android/taskkeeper/MainActivity.java

@@ -19,6 +19,7 @@
 
 import com.crashlytics.android.Crashlytics;
 import com.firebase.ui.database.FirebaseRecyclerAdapter;
+import com.google.android.gms.common.GoogleApiAvailability;
 import com.google.android.gms.tasks.OnCompleteListener;
 import com.google.android.gms.tasks.Task;
 import com.google.firebase.auth.AuthResult;
@@ -48,6 +49,8 @@ protected void onCreate(Bundle savedInstanceState) {
         mAuth = FirebaseAuth.getInstance();
         mAuth.addAuthStateListener(this);
 
+        GoogleApiAvailability.getInstance().makeGooglePlayServicesAvailable(this);
+
         mRemoteConfig = FirebaseRemoteConfig.getInstance();
         FirebaseRemoteConfigSettings remoteConfigSettings = new FirebaseRemoteConfigSettings.Builder()
                 .setDeveloperModeEnabled(BuildConfig.DEBUG)
@@ -98,6 +101,7 @@ public void onAuthStateChanged(@NonNull FirebaseAuth auth) {
     @Override
     public void onResume() {
         super.onResume();
+        GoogleApiAvailability.getInstance().makeGooglePlayServicesAvailable(this);
         updateAuth();
     }