Memo transaction

Post memo Example reading the code 'BURN' from OP_RETURN to handle TX differently: https://github.com/Permissionless-Software-Foundation/token-liquidity/blob/master/src/lib/bch.js#L431-L475
Reply to memo 3704c1a2b61c665fe5751e4e3fe38d83007d6efd06e8c93df8b076683a23c221