code: def signature(self, name, file_name, file_type, file_text, **kwargs):
          
          group_obj = Signature(name, file_name, file_type, file_text, **kwargs)
          return self._group(group_obj)
docs: Add Signature data to Batch object.
  
          Valid file_types:
          + Snort ®
          + Suricata
          + YARA
          + ClamAV ®
          + OpenIOC
          + CybOX ™
          + Bro
          + Regex
          + SPL - Splunk ® Search Processing Language
  
          Args:
              name (str): The name for this Group.
              file_name (str): The name for the attached signature for this Group.
              file_type (str): The signature type for this Group.
              file_text (str): The signature content for this Group.
              date_added (str, kwargs): The date timestamp the Indicator was created.
              xid (str, kwargs): The external id for this Group.
  
          Returns:
              obj: An instance of Signature.