Add Connection class

web3.js/examples/get-balance.js

@@ -0,0 +1,19 @@
+/*
+ Fetch the balance of an account
+*/
+
+//eslint-disable-next-line import/no-commonjs
+const solanaWeb3 = require('..');
+//const solanaWeb3 = require('@solana/web3.js');
+
+const account = new solanaWeb3.Account();
+
+let url;
+url = 'http://localhost:8899';
+//url = 'http://master.testnet.solana.com:8899';
+const connection = new solanaWeb3.Connection(url);
+
+connection.getBalance(account.publicKey)
+.then((balance) => {
+  console.log(`${account.publicKey} has a balance of ${balance}`);
+});