code: def set_file_atrificat_of_project(self, doc, symbol, value):
          
          if self.has_package(doc) and self.has_file(doc):
              self.file(doc).add_artifact(symbol, value)
          else:
              raise OrderError('File::Artificat')
docs: Sets a file name, uri or home artificat.
          Raises OrderError if no package or file defined.