code: def create(self, installed_add_on_sid):
          
          data = values.of({'InstalledAddOnSid': installed_add_on_sid, })
  
          payload = self._version.create(
              'POST',
              self._uri,
              data=data,
          )
  
          return AssignedAddOnInstance(
              self._version,
              payload,
              account_sid=self._solution['account_sid'],
              resource_sid=self._solution['resource_sid'],
          )
docs: Create a new AssignedAddOnInstance
  
          :param unicode installed_add_on_sid: The SID that identifies the Add-on installation
  
          :returns: Newly created AssignedAddOnInstance
          :rtype: twilio.rest.api.v2010.account.incoming_phone_number.assigned_add_on.AssignedAddOnInstance