introduce UUPS upgradeable

circuits/circuits/disclose/vc_and_disclose.circom

@@ -5,7 +5,7 @@ include "../utils/passport/disclose/disclose.circom";
 include "../utils/passport/disclose/proveCountryIsNotInList.circom";
 include "../utils/passport/ofac/ofac_name.circom";
 
-template VC_AND_DISCLOSE( nLevels,FORBIDDEN_COUNTRIES_LIST_LENGTH) {
+template VC_AND_DISCLOSE(nLevels,FORBIDDEN_COUNTRIES_LIST_LENGTH) {
 
     signal input secret;
     signal input attestation_id;

contracts/README.md

@@ -2,6 +2,17 @@
 
 Contracts for OpenPassport.
 
+## OpenPassport Contract Architecture
+
+![OpenPassport Contract Architecture](./assets/contract_architecture_v1.png)
+
+## Cautions
+
+When you do the upgrade, be careful with this storage patterns
+- You can not change the order in which the contract state variables are declared, nor their type.
+Pls see this page for more details: https://docs.openzeppelin.com/upgrades-plugins/writing-upgradeable#modifying-your-contracts
+
+## Operations
 Try running some of the following tasks:
 
 ```shell

contracts/contracts/IdentityVerificationHub.sol

@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.28;
+
+import "./proxy/PrivacyIDProxy.sol";
+
+contract IdentityVerificationHub is PrivacyIDProxy {
+    constructor(address _logic, bytes memory _data) PrivacyIDProxy(_logic, _data) {}
+}