title: Add custom package source to Visual Studio Code
body: <p>Does anybody know how to add custom package source to Visual Studio <strong>Code</strong>?</p>
  
  <p>E.g. I'd like to add <a href="https://www.myget.org/F/aspnet-contrib/api/v3/index.json" rel="noreferrer">https://www.myget.org/F/aspnet-contrib/api/v3/index.json</a> as a package source and drive these packages through project.json.</p>