Start new Node.js-based backend

backend/karaoqueue-backend/src/index.ts

@@ -0,0 +1,13 @@
+import express = require("express");
+
+const app: express.Application = express();
+
+app.get('/', (req, res) => {
+    res.send('Hello World!');
+    // tslint:disable-next-line: no-console
+    console.log(req.headers["user-agent"]);
+});
+app.listen(3000, () => {
+    // tslint:disable-next-line: no-console
+    console.log('App is listening on port 3000!');
+});