Add example task for balance with arg to STDOUT

README.md

@@ -42,3 +42,7 @@ npx hardhat run scripts/redeem-cheque.js --network localhost
 ```
 
 Now Alice has send a cheque to Bob, and Bob has received it from the Swap contract. Cheques can be sent and received off-chain, and only settled once Bob wants to.
+
+## Example task
+
+`npx hardhat balance --account 0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266`

hardhat.config.js

@@ -1,3 +1,5 @@
+require("@nomiclabs/hardhat-web3");
+
 require("@nomiclabs/hardhat-waffle");
 
 // This is a sample Hardhat task. To learn how to create your own go to
@@ -10,6 +12,15 @@ task("accounts", "Prints the list of accounts", async () => {
   }
 });
 
+task("balance", "Prints an account's balance")
+  .addParam("account", "The account's address")
+  .setAction(async taskArgs => {
+    const account = web3.utils.toChecksumAddress(taskArgs.account);
+    const balance = await web3.eth.getBalance(account);
+
+    console.log(web3.utils.fromWei(balance, "ether"), "ETH");
+  });
+
 // You need to export an object to set up your config
 // Go to https://hardhat.org/config/ to learn more