initial commit with apps from course repo

nodejs-helloworld/app.js

@@ -0,0 +1,11 @@
+var express = require('express');
+app = express();
+
+app.get('/', function (req, res) {
+  res.send('Hello World!\n');
+});
+
+app.listen(8080, function () {
+  console.log('Example app listening on port 8080!');
+});
+