code: def prj_add_atype(self, *args, **kwargs):
          
          if not self.cur_prj:
              return
          dialog = AtypeAdderDialog(project=self.cur_prj)
          dialog.exec_()
          atypes = dialog.atypes
          for atype in atypes:
              atypedata = djitemdata.AtypeItemData(atype)
              treemodel.TreeItem(atypedata, self.prj_atype_model.root)
docs: Add more assettypes to the project.
  
          :returns: None
          :rtype: None
          :raises: None