implemented tagging of bookmarks

tags/src/main/java/de/srsoftware/umbrella/tags/TagModule.java

@@ -136,4 +136,9 @@ public class TagModule extends BaseHandler implements TagService {
 		save(module,entityId,userIds,List.of(tag));
 		return tag;
 	}
+
+	@Override
+	public UserService userService() {
+		return users;
+	}
 }