title: Convert WindowsIdentity to ClaimsIdentity
body: <p>I have a web application and I need to use there AD UserGroups. I need to do this in my views and conntrollers:</p>
  
  <pre><code>var User = System.Web.HttpContext.Current.User;
  if (User.IsInRole("DOMAIN\\group"))
  {
                  Show();            
  }
  </code></pre>
  
  <p>I´m using ClaimsBased Identity in application, but I have access to WindowsIndetity too. What I want is add WindowsIdentity claims / groups to ClaimIdentity and after that work with ActiveDirectory userGroups like roles.</p>
  
  <p>It is possible ?</p>
  
  <p>Thanks for help !</p>