Update build.gradle

Author: pavankuppa1

app/build.gradle

@@ -29,9 +29,14 @@ dependencies {
     implementation 'com.android.support:cardview-v7:27.1.1'
     implementation 'com.android.support:design:27.1.1'
     implementation 'com.squareup.retrofit2:retrofit:2.3.0'
+    implementation 'com.android.support:preference-v7:27.1.1'
+    compile 'com.google.firebase:firebase-database:11.0.4'
+    compile 'com.google.firebase:firebase-storage:11.0.4'
 
     implementation 'com.stephentuso:welcome:1.4.1'
 
     implementation 'com.android.support:recyclerview-v7:27.1.1'
 
 }
+
+apply plugin: 'com.google.gms.google-services'