code: def addFeatureSet(self):
          
          self._openRepo()
          dataset = self._repo.getDatasetByName(self._args.datasetName)
          filePath = self._getFilePath(self._args.filePath,
                                       self._args.relativePath)
          name = getNameFromPath(self._args.filePath)
          featureSet = sequence_annotations.Gff3DbFeatureSet(
              dataset, name)
          referenceSetName = self._args.referenceSetName
          if referenceSetName is None:
              raise exceptions.RepoManagerException(
                  "A reference set name must be provided")
          referenceSet = self._repo.getReferenceSetByName(referenceSetName)
          featureSet.setReferenceSet(referenceSet)
          ontologyName = self._args.ontologyName
          if ontologyName is None:
              raise exceptions.RepoManagerException(
                  "A sequence ontology name must be provided")
          ontology = self._repo.getOntologyByName(ontologyName)
          self._checkSequenceOntology(ontology)
          featureSet.setOntology(ontology)
          featureSet.populateFromFile(filePath)
          featureSet.setAttributes(json.loads(self._args.attributes))
          self._updateRepo(self._repo.insertFeatureSet, featureSet)
docs: Adds a new feature set into this repo