title: Eclipse IDE: Add/change default filetypes?
body: <p>When I create a new file in Eclipse, there's a wide selection of different alternatives appearing in Eclipse.</p>
  
  <p>However I am missing a couple of file which I need to open the "file create wizard" to create - JS files included.</p>
  
  <p>How can I add my own file types as a default choice to appear in the "new files" menu?</p>
  
  <p>Screenshot of the menu I am referring to:
  <img src="https://i.stack.imgur.com/XHMBM.png" alt="alt text"></p>