code: def prj_add_user(self, *args, **kwargs):
          
          if not self.cur_prj:
              return
          dialog = UserAdderDialog(project=self.cur_prj)
          dialog.exec_()
          users = dialog.users
          for user in users:
              userdata = djitemdata.UserItemData(user)
              treemodel.TreeItem(userdata, self.prj_user_model.root)
          self.cur_prj.save()
docs: Add more users to the project.
  
          :returns: None
          :rtype: None
          :raises: None