adding exercies for steps 2-1 and 2-2

step2-01/demo/src/async/index.ts

@@ -0,0 +1,12 @@
+async function fetchSomething() {
+  const response = await fetch('http://localhost:3000/hello');
+  return await response.text();
+}
+
+// Async functions always returns Promise
+fetchSomething().then(text => {
+  console.log('hello ' + text);
+});
+
+// adding an export to turn this into a "module"
+export default {};