title: Navigation drawer menu item with titles and sub titles
body: <p>I have a navigation drawer prototype. we have heading and subheading in the same. am using menu group to include the titles.</p>
  
  <p>1) just want to add sub title or help text for the navigation drawer.
  2) want to customise the icon size to fit the whole heading and sub heading so it looks like the image below.</p>
  
  <pre><code>&lt;item
          android:id="@+id/nav_home"
          android:icon="@drawable/ic_menu_home"
          android:subtitle="View your biorhythm" &lt;!-- This should be sub title. --&gt;
          android:title="Home"
          /&gt;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/eKt8l.png" rel="noreferrer"><img src="https://i.stack.imgur.com/eKt8l.png" alt="This is how a menu item should look like."></a></p>