Added the string for the Text

It is just showing "No bookmarks yet!" to the user

Author: LinX64

feature/bookmarks/src/main/res/values/strings.xml

@@ -20,4 +20,5 @@
     <string name="top_app_bar_title">Saved</string>
     <string name="top_app_bar_action_search">Search</string>
     <string name="top_app_bar_action_menu">Menu</string>
+    <string name="bookmarks_empty">No bookmarks yet!</string>
 </resources>