title: How to add a custom menu for google drive
body: <p>As a part of project requirement I need to add a custom menu (context menu) to the google drive right click options. 
  As per my research google app script can help for creating a custom menu for google docs, google form and google sheet. However I haven't yet come across a way to add a custom menus for google drive.  </p>
  
  <p>I cannot use chrome extension as I need it to be all browser compatible.</p>
  
  <p>Any ideas if it's even supported and possible.</p>
  
  <p>Any help is appreciated! </p>