backend init

backend/index.js

@@ -0,0 +1,12 @@
+
+const express = require('express')
+const app = express()
+const port = process.env.PORT || 3000
+
+app.get('/', (req, res) => {
+  res.send('Hello World!')
+})
+
+app.listen(port, () => {
+  console.log(`Example app listening at http://localhost:${port}`)
+})