feat: add new multisig wallet assignment

README.md

@@ -13,6 +13,9 @@ For the sake of flexibility, each assignment is a separate package with its own
 ## Assignments
 
 - [Simple Proxy Contract](./assignments/simple-proxy-contract)
+- [Upgradeable Proxy Contract](./assignments/upgradeable-proxy-contract)
+- [Transparent Proxy Contract](./assignments/transparent-proxy-contract) (TODO)
+- [Multisig Wallet](./assignments/multisig-wallet)
 
 ## Setup
 

assignments/multisig-wallet/README.md

@@ -0,0 +1,2 @@
+# Multisig Wallet
+

assignments/multisig-wallet/contracts/Counter.sol

@@ -0,0 +1,18 @@
+pragma solidity ^0.8.0;
+
+contract Counter {
+    uint256 public counter;
+
+    function increment() public {
+        counter++;
+    }
+
+    function add(uint256 x) public {
+        counter += x;
+    }
+
+    // Just using this to make sure you've correctly handled reverts!
+    function fail() public {
+        revert("This function should fail");
+    }
+}

assignments/multisig-wallet/contracts/MultisigWallet.sol

@@ -0,0 +1,83 @@
+pragma solidity ^0.8.0;
+
+contract MultisigWallet {
+    // struct Transaction {
+    //     // fill me in
+    // }
+
+    constructor(
+        address[] memory _owners,
+        uint256 _required
+    )
+        public
+    {
+        revert("Implement me!");
+    }
+
+    function submitTransaction(
+        address _target,
+        uint256 _value,
+        bytes memory _data
+    )
+        public
+    {
+        revert("Implement me!");
+    }
+
+    function confirmTransaction(
+        uint256 _transactionId
+    )
+        public
+    {
+        revert("Implement me!");
+    }
+
+    function revokeConfirmation(
+        uint256 _transactionId
+    )
+        public
+    {
+        revert("Implement me!");
+    }
+
+    function executeTransaction(
+        uint256 _transactionId
+    )
+        public
+    {
+        revert("Implement me!");
+    }
+
+    function addOwner(
+        address _owner
+    )
+        public
+    {
+        revert("Implement me!");
+    }
+
+    function removeOwner(
+        address _owner
+    )
+        public
+    {
+        revert("Implement me!");
+    }
+
+    function replaceOwner(
+        address _owner,
+        address _newOwner
+    )
+        public
+    {
+        revert("Implement me!");
+    }
+
+    function changeRequirement(
+        uint256 _required
+    )
+        public
+    {
+        revert("Implement me!");
+    }
+}

assignments/multisig-wallet/hardhat.config.ts

@@ -0,0 +1,13 @@
+import { HardhatUserConfig } from 'hardhat/types'
+
+// Plugins
+import '@nomiclabs/hardhat-ethers'
+import '@nomiclabs/hardhat-waffle'
+
+const config: HardhatUserConfig = {
+  solidity: {
+    version: '0.8.11',
+  }
+}
+
+export default config

assignments/multisig-wallet/package.json

@@ -0,0 +1,26 @@
+{
+  "name": "simple-proxy-contracts",
+  "version": "1.0.0",
+  "main": "index.js",
+  "license": "MIT",
+  "private": true,
+  "scripts": {
+    "compile": "hardhat compile",
+    "test": "hardhat test"
+  },
+  "devDependencies": {
+    "@nomiclabs/hardhat-ethers": "^2.0.4",
+    "@nomiclabs/hardhat-waffle": "^2.0.1",
+    "@types/chai-as-promised": "^7.1.4",
+    "@types/mocha": "^9.0.0",
+    "@types/node": "^17.0.8",
+    "chai": "^4.3.4",
+    "chai-as-promised": "^7.1.1",
+    "ethereum-waffle": "^3.4.0",
+    "ethers": "^5.5.3",
+    "hardhat": "^2.8.2",
+    "mocha": "^9.1.3",
+    "ts-node": "^10.4.0",
+    "typescript": "^4.5.4"
+  }
+}