add scroll example

examples/scroll/.env-sample

@@ -0,0 +1,21 @@
+# This is a sample .env file for use in local development.
+
+# Duplicate this file as .env here
+
+# Your Private key
+
+DEVNET_PRIVKEY="0x your key here"
+
+# Hosted Aggregator Node (JSON-RPC Endpoint). This is Arbitrum Sepolia Testnet, can use any Arbitrum chain
+
+L2RPC="https://sepolia-rpc.scroll.io/"
+
+# Ethereum RPC; i.e., for Sepolia https://sepolia.infura.io/v3/<your infura key>
+
+L1RPC=""
+
+# Arbitrum chain name
+SCROLL="SCROLLTEST"
+
+# Ethereum chain name
+ETHEREUM="SEPOLIA"

examples/scroll/.gitignore

@@ -0,0 +1 @@
+.env

examples/scroll/hardhat.config.js

@@ -0,0 +1,13 @@
+require('@nomiclabs/hardhat-ethers');
+require('./scripts/1_initConfig');
+require('./scripts/2_syncL2Requests');
+require('./scripts/3_syncBatchRoot');
+
+const BaseConfig = require('../../hardhat.base.config');
+
+module.exports = Object.assign({}, BaseConfig, {
+  paths: {
+    cache: '../../cache',
+    artifacts: '../../artifacts',
+  },
+});