title: get rate for a temporary shipment
body: <p>I am trying to use easy post API and I would like to get shipment quote without creating then? (temorary shipment).
  Idea is customer wants to have a shipment quote but he have no take decision to buy then and maybe he will buy then with another api.</p>
  
  <p>What is the correct way to process this with easy post API?</p>