set 'hello world' for description() to contract
qcli callcontract 816e13de2966cc56ca330d089aab849e5928eed5 90c3f38f 0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000c48656c6c6f20576f726c642100000000000000000000000