[backend][nodejs] Initialize with Hello World

backend/nodejs/app.js

@@ -0,0 +1,13 @@
+const http = require('http');
+
+const port = 3000;
+
+const server = http.createServer((request, response) => {
+    response.statusCode = 200;
+    response.setHeader('Content-Type', 'text/plain');
+    response.end('Hello World');
+});
+
+server.listen(port, () => {
+    console.log(`Server listening on port ${port}`)
+});