title: Bulk Add All (*.js) or (*.css) files to service worker cache on install
body: <p>If I have a service worker registered with the doc root ( / ) as its scope,
  And my Document Layout is like so:</p>
  
  <ul>
  <li>Doc-Root
  
  <ul>
  <li>Includes
  
  <ul>
  <li>JS
  
  <ul>
  <li>PHP/JS /HTML Files</li>
  </ul></li>
  <li>CSS
  
  <ul>
  <li>PHP/CSS Files</li>
  </ul></li>
  <li>Typography</li>
  </ul></li>
  </ul></li>
  </ul>
  
  <p>How Do I Add All JS Only/CSS Only files to the service worker cache <strong>On Install</strong> and exclude other extensions Under each Directory?</p>