code: def add_permissions(self, grp_name, resource, permissions):
          
          self.project_service.set_auth(self._token_project)
          self.project_service.add_permissions(grp_name, resource, permissions)
docs: Add additional permissions for the group associated with the resource.
  
          Args:
              grp_name (string): Name of group.
              resource (intern.resource.boss.Resource): Identifies which data
                  model object to operate on.
              permissions (list): List of permissions to add to the given resource
  
          Raises:
              requests.HTTPError on failure.