Added proxyAdmin Contract

contracts/proxy/proxyMasterSigAdmin.sol

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+import "@openzeppelin/contracts/proxy/ProxyAdmin.sol";
+
+/**
+ * @dev This is an auxiliary contract meant to be assigned as the admin of a {TransparentUpgradeableProxy}. For an
+ * explanation of why you would want to use this see the documentation for {TransparentUpgradeableProxy}.
+ */
+contract InstaMasterProxy is ProxyAdmin {
+    constructor(address masterAddress) {
+        require(masterAddress != address(0), "not-vaild-address");
+        transferOwnership(masterAddress);
+    }
+}