Create PIBankDAO.sol

blockchain_integration/pi_network/contracts/PI-bank/contracts/PIBankDAO.sol

@@ -0,0 +1,23 @@
+pragma solidity ^0.8.0;
+
+contract PIBankDAO {
+    mapping (address => uint256) public votes;
+
+    function proposeChange(address proposer, bytes32 proposal) public {
+        // Propose a change to the DAO
+        votes[proposer] = 1;
+    }
+
+    function voteOnProposal(address voter, bytes32 proposal) public {
+        // Vote on a proposal
+        require(votes[voter] == 0, "Already voted");
+        votes[voter] = 1;
+    }
+
+    function executeProposal(bytes32 proposal) public {
+        // Execute a proposal if it has reached a quorum
+        require(votes[proposal] >= quorum, "Proposal not approved");
+        // Execute the proposal
+        //...
+    }
+}