title: How to reproduce the "add as a link" feature on DNX projects?
body: <p>I have a project with some files (xml) with some configuration I would like to share with my integration test project.</p>
  
  <p>Using a regular project I can "Add as a link" the files for that, so when I change the config file the test project is updated as well.</p>
  
  <p>How can I do the same with dnx projects (altering project.json)?</p>