from issue #7 ### 分红合约 采用类似DCRM的分红合约逻辑:向合约中抵押DAO Token,以获得按周期结算的收入 参考源: https://github.com/buckyos/DCRM/blob/046d840aa5726549a34a64f4dc8836c4bc649f28/contracts/dividend.sol