display notification bell icon beside URL bar

app/src/main/res/drawable-anydpi/ic_notifications.xml

@@ -0,0 +1,11 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="#FFFFFF"
+    android:alpha="0.8">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M12,22c1.1,0 2,-0.9 2,-2h-4c0,1.1 0.89,2 2,2zM18,16v-5c0,-3.07 -1.64,-5.64 -4.5,-6.32L13.5,4c0,-0.83 -0.67,-1.5 -1.5,-1.5s-1.5,0.67 -1.5,1.5v0.68C7.63,5.36 6,7.92 6,11v5l-2,2v1h16v-1l-2,-2z"/>
+</vector>

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

@@ -61,6 +61,20 @@
                         android:src="@drawable/ic_close"
                         android:tint="@color/actionBarForeground" />
                 </LinearLayout>
+
+                <LinearLayout
+                    android:id="@+id/wunderbar_notifications"
+                    android:clickable="true"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_alignParentRight="true"
+                    android:layout_centerVertical="true">
+                    <ImageView
+                        android:layout_width="24dp"
+                        android:layout_height="24dp"
+                        android:src="@drawable/ic_notifications"
+                        android:tint="@color/actionBarForeground" />
+                </LinearLayout>
             </RelativeLayout>
         </androidx.appcompat.widget.Toolbar>
     </com.google.android.material.appbar.AppBarLayout>