code: def create(self, friendly_name):
          
          data = values.of({'FriendlyName': friendly_name, })
  
          payload = self._version.create(
              'POST',
              self._uri,
              data=data,
          )
  
          return CredentialListInstance(self._version, payload, account_sid=self._solution['account_sid'], )
docs: Create a new CredentialListInstance
  
          :param unicode friendly_name: Human readable descriptive text
  
          :returns: Newly created CredentialListInstance
          :rtype: twilio.rest.api.v2010.account.sip.credential_list.CredentialListInstance