title: TFS users just allowed to create bugs
body: <p>We have a VSTO account and we are currently opening a test environment for one of our customer.
  We want to provide to this customer a way to declare bugs and see all the bugs that are currently declared.
  We just want to allow these permissions but in the VSTS groups, there is no "tester" group.
  What is the best way to proceed?</p>