title: vscode: set encoding for files with a specific extension
body: <p>I'm working with visual studio code to edit classic asp pages. </p>
  
  <p>In order not to break everything, I need .asp files to be read and written using Windows 1252 encoding.</p>
  
  <p>Is there some way to configure it? if it could be done on a folder/project/workspace basis that would be great.</p>