title: How do I programmatically add a file to a Solution?
body: <p>I am developing a VS Package and part of the functionality that I need to implement is to add a file to the Solution Items of the currently open Solution.</p>
  
  <p>This is exactly the same action that would be performed manually if you right-click on a Solution and choose Add > Existing Item.  Then selected a file on disk.</p>
  
  <p>I have taken a good look at the DTE and DTE2 interfaces and can see the operations to add and manipulate projects but there doesn't appear to be any operations for adding individual files.</p>
  
  <p>Thanks.</p>