menu_toolbar.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"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context=".MainActivity">

    <item
        android:id="@+id/action_addNotes"
        android:orderInCategory="2"
        android:title="@string/add_new_notes"
        android:icon="@android:drawable/ic_menu_add"
        app:showAsAction="ifRoom">
    </item>
</menu>