feat: add Hardhat support with examples for Counter & UniversalCounter on Push Chai

tutorials/simple-counter/hardhat-simple-counter/.gitignore

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+node_modules
+.env
+
+# Hardhat files
+/cache
+/artifacts
+
+# TypeChain files
+/typechain
+/typechain-types
+
+# solidity-coverage files
+/coverage
+/coverage.json
+
+# Hardhat Ignition default folder for deployments against a local node
+ignition/deployments/chain-31337

tutorials/simple-counter/hardhat-simple-counter/contracts/Counter.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.22;
+
+contract Counter {
+    uint256 public countPC;
+    event CountIncremented(uint256 indexed countPC, address indexed caller);
+
+    function increment() public {
+        countPC += 1;
+        emit CountIncremented(countPC, msg.sender);
+    }
+} 

tutorials/simple-counter/hardhat-simple-counter/hardhat.config.ts

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+import "dotenv/config";
+import "@nomicfoundation/hardhat-toolbox";
+import "@nomicfoundation/hardhat-verify";
+
+const ACCOUNTS = process.env.PRIVATE_KEY
+  ? [`${process.env.PRIVATE_KEY}`]
+  : [];
+
+export default {
+  defaultNetwork: "hardhat",
+
+  gasReporter: {
+    enabled: false,
+  },
+
+  networks: {
+    // ✅ Local testing network (IMPORTANT)
+    hardhat: {
+      chainId: 31337,
+    },
+
+    // 🌐 :contentReference[oaicite:0]{index=0}
+    pushTestnet: {
+      chainId: 42101,
+      url: "https://evm.donut.rpc.push.org/",
+      accounts: ACCOUNTS,
+    },
+  },
+
+  etherscan: {
+    apiKey: {
+      pushTestnet: "NO_API_KEY_REQUIRED",
+    },
+    customChains: [
+      {
+        network: "pushTestnet",
+        chainId: 42101,
+        urls: {
+          apiURL: "https://donut.push.network/api",
+          browserURL: "https://donut.push.network",
+        },
+      },
+    ],
+  },
+
+  sourcify: {
+    enabled: false,
+  },
+
+  solidity: {
+    version: "0.8.28",
+    settings: {
+      evmVersion: "paris",
+      optimizer: {
+        enabled: true,
+        runs: 200,
+      },
+    },
+  },
+
+  paths: {
+    sources: "./contracts",
+    tests: "./test",
+    cache: "./cache",
+    artifacts: "./artifacts",
+  },
+};

tutorials/simple-counter/hardhat-simple-counter/package.json

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+{
+  "name": "hardhat-counter-project",
+  "devDependencies": {
+    "@nomicfoundation/hardhat-ethers": "^3.0.0",
+    "@nomicfoundation/hardhat-toolbox": "^6.1.0",
+    "@nomicfoundation/hardhat-verify": "^2.0.0",
+    "dotenv": "^16.0.0",
+    "hardhat": "^2.28.4"
+  },
+  "dependencies": {
+  }
+}