Create menu with one option

app/src/main/res/menu/timeline_menu.xml

+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <item
+        android:id="@+id/settings"
+        android:icon="@drawable/ic_settings"
+        android:title="@string/settings"
+        app:showAsAction="ifRoom" />
+
+</menu>
\ No newline at end of file