code: public TemplateDraft createEmbeddedTemplateDraft(EmbeddedRequest req) throws HelloSignException {
          return new TemplateDraft(httpClient.withAuth(auth).withPostFields(req.getPostFields())
                  .post(BASE_URI + TEMPLATE_CREATE_EMBEDDED_DRAFT_URI).asJson());
      }
docs: Creates a template draft that can be used for embedded template creation.
  
  @param req EmbeddedRequest
  @return Template the unclaimed template draft
  @throws HelloSignException thrown if there's a problem processing the
  HTTP request or the JSON response.