title: VSTS all time integration
body: <p>I have a web-site with users "site-account". </p>
  
  <p>Users also are registered in VSTS / (project1.visualstudio.com, project2.visualstudio.com, ...) "vsts-account"</p>
  
  <p>I need allow user once link a "site-account" to "vsts-account" (one or multiple)</p>
  
  <p>After link a account i can read / write a Work-Backlog item in any time. 
  Example, in background read Work-Backlog and send email notification.</p>
  
  <p>I cant understand how i can link and grand access to "vsts-account" from "site-account"</p>
  
  <p>I can create a Extension, that will be installed in VSTS.</p>
  
  <p><strong>Thanks for any links</strong></p>