feat(scripts): add deployment script & instructions

packages/contracts/README.md

@@ -16,3 +16,30 @@ This library facilitates checking signatures over CCIP read responses.
 
 ### [OffchainResolver.sol](contracts/OffchainResolver.sol)
 This contract implements the offchain resolution system. Set this contract as the resolver for a name, and that name and all its subdomains that are not present in the ENS registry will be resolved via the provided gateway by supported clients.
+
+## Deployment instruction
+
+1. Set the following env variables:
+
+    * *REMOTE_GATEWAY*  
+    The target url (default: localhost:8080)
+
+    * *DEPLOYER_KEY* (*mandatory)  
+    The private key use to deploy the contract (also the contract owner)
+
+    * *SIGNER_KEY* (*mandatory)  
+    The public key which is approved as the trusted signer
+
+    * *INFURA_ID*  
+    API key for network provider
+
+    * *ETHERSCAN_API_KEY*
+
+    * *NETWORK*  
+    The target network (default: sepolia)
+
+2. Run the following command
+
+```bash
+./deploy.sh
+```

packages/contracts/deploy.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+set -eu
+
+# Can only be overwritten from the .env file, not from the command line!
+NETWORK=sepolia
+
+# Load .env
+source .env
+
+# Deploy OffchainResolver
+npx hardhat --network $NETWORK deploy --tags demo