feat: sample of hardhat configuration for mode devs

Guides/Hardhat_Config_Sample.md

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+# Configuring Hardhat for development at Mode
+
+This article delves into configuring Hardhat, a leading Ethereum development framework, specifically tailored for development within the Mode ecosystem. It offers a comprehensive overview of the configuration file, encompassing network setup, Solidity compiler settings, gas usage reporting, Sourcify integration, and Etherscan integration. Each configuration aspect is elaborated upon, providing developers with the necessary insights to optimize their development environment for Mode-specific projects.
+
+```ts
+import { HardhatUserConfig } from 'hardhat/config'
+import '@nomicfoundation/hardhat-toolbox'
+require('hardhat-deploy')
+import * as dotenv from 'dotenv'
+dotenv.config()
+
+// Load environment variables
+const { DEPLOYER_PRIVATE_KEY, ETHERSCAN_API_KEY } = process.env
+const providerApiKey = process.env.ALCHEMY_API_KEY
+
+// Configuration object for Hardhat
+const config: HardhatUserConfig = {
+  networks: {
+    // Configuration for local development network
+    hardhat: {
+      forking: {
+        // URL for forking mainnet
+        url: `https://eth-mainnet.alchemyapi.io/v2/${providerApiKey}`,
+        // Enable forking if MAINNET_FORKING_ENABLED is 'true'
+        enabled: process.env.MAINNET_FORKING_ENABLED === 'true',
+      },
+    },
+    // Configuration for ModeTest network
+    modetest: {
+      // URL for ModeTest network
+      url: 'https://sepolia.mode.network',
+      // Chain ID for ModeTest network
+      chainId: 919,
+      // Account(s) to use for deployments on ModeTest network
+      accounts: [DEPLOYER_PRIVATE_KEY as string],
+      // Gas price for transactions on ModeTest network
+      gasPrice: 10000,
+    },
+    // Configuration for Mode network
+    mode: {
+      // URL for Mode network
+      url: 'https://mainnet.mode.network',
+      // Chain ID for Mode network
+      chainId: 34443,
+      // Account(s) to use for deployments on Mode network
+      accounts: [DEPLOYER_PRIVATE_KEY as string],
+    },
+  },
+  // Solidity compiler configuration
+  solidity: {
+    // Version of Solidity compiler to use
+    version: '0.8.20',
+    settings: {
+      // EVM version
+      evmVersion: 'london',
+    },
+  },
+  // Configuration for gas reporting
+  gasReporter: {
+    // Enable gas reporting if REPORT_GAS is defined
+    enabled: process.env.REPORT_GAS !== undefined,
+    // Set currency for gas reporting
+    currency: 'USD',
+  },
+  // Configuration for Sourcify
+  sourcify: {
+    // Enable Sourcify
+    enabled: true,
+  },
+  // Configuration for Etherscan integration
+  etherscan: {
+    // API key for Etherscan
+    apiKey: {
+      mode: ETHERSCAN_API_KEY as string,
+    },
+    // Custom chains configuration for Etherscan
+    customChains: [
+      // Configuration for ModeTest network in Etherscan
+      {
+        network: 'modetest',
+        chainId: 919,
+        urls: {
+          // API URL for ModeTest network explorer
+          apiURL: 'https://sepolia.explorer.mode.network/api',
+          // Browser URL for ModeTest network explorer
+          browserURL: 'https://sepolia.explorer.mode.network/',
+        },
+      },
+      // Configuration for Mode network in Etherscan
+      {
+        network: 'mode',
+        chainId: 34443,
+        urls: {
+          // API URL for Mode network explorer
+          apiURL: 'https://explorer.mode.network/api',
+          // Browser URL for Mode network explorer
+          browserURL: 'https://explorer.mode.network/',
+        },
+      },
+    ],
+  },
+}
+
+export default config
+```
+
+| Property    | Description                                                                       |
+| ----------- | --------------------------------------------------------------------------------- |
+| networks    | Configuration for different Ethereum networks.                                    |
+| - hardhat   | Configuration for local Hardhat network for development and testing.              |
+| - modetest  | Configuration for ModeTest network.                                               |
+| - mode      | Configuration for Mode network.                                                   |
+| solidity    | Configuration for Solidity compiler.                                              |
+| gasReporter | Configuration for gas usage reporting during tests.                               |
+| sourcify    | Configuration for Sourcify to verify contract source.                             |
+| etherscan   | Configuration for Etherscan integration, including API key and custom chain URLs. |