fix: admin contract

Author: mpetrun5

contracts/Admin.sol

@@ -9,6 +9,8 @@ import "@openzeppelin/contracts/access/Ownable.sol";
     @author ChainSafe Systems.
  */
 contract Admin is Ownable {
+    address public _MPCAddress;
+
     event StartKeygen();
     event EndKeygen();
     event KeyRefresh(string hash);
@@ -49,4 +51,4 @@ contract Admin is Ownable {
     function refreshKey(string memory hash) external onlyOwner {
         emit KeyRefresh(hash);
     }
-}
+}