code: public ItemRequest<Workspace> addUser(String workspace) {
      
          String path = String.format("/workspaces/%s/addUser", workspace);
          return new ItemRequest<Workspace>(this, Workspace.class, path, "POST");
      }
docs: The user can be referenced by their globally unique user ID or their email address.
  Returns the full user record for the invited user.
  
  @param  workspace The workspace or organization to invite the user to.
  @return Request object