Add ripple effect to feed card

app/src/main/res/layout/feed_card.xml

@@ -2,7 +2,8 @@
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
-    android:orientation="vertical">
+    android:orientation="vertical"
+    android:background="?android:attr/selectableItemBackground">
 
     <ImageView
         android:id="@+id/big_object_picture"