title: Two Templates in One Envelope with DocuSign API
body: <p>I've been able to successfully start an envelope with a template using the <code>templateID</code>, but I'm attempting to generate an envelope with <em>two</em> documents inside that both have templates. In the DocuSign website interface it's possible to start a new envelope then "check off" multiple templates to add to the envelope.</p>
  
  <p>I've found the API calls to:</p>
  
  <ul>
  <li>Start an envelope with a template</li>
  <li>Get a template</li>
  <li>Add a <em>document</em> to an envelope</li>
  </ul>
  
  <p>However, there's unfortunately nothing that I can find to add a <em>template</em> to a draft envelope once it's been created. The question here, in case it's not obvious, is: what is the API call to generate a new document <em>from a template</em> and add it to a pre-existing envelope in <code>created</code> status?</p>