title: add column that browses on a sharepoint content type
body: <p>Im creating a new content type in sharepoint.</p>
  
  <p>I am trying to add a new column/field that will let the user browse for an "asset" eg picture or video that exists in the sharepoint site.</p>
  
  <p>how do i add a column that gives the user the ability to browse.</p>
  
  <p>thanks</p>