Update stuff

doc/README.md

@@ -38,4 +38,14 @@ or
 
 ![alt text](./assets/start_node_server2.png)
 
-the second method uses the [nodemon.json](../nodemon.json) to configure nodemon.
+the second method uses the [nodemon.json](../nodemon.json) to configure nodemon.
+
+# .env file
+
+To have different behavior on your dev host, you cloud add an .env file.
+
+Here are the key-values of an .evc file:
+
+```bash
+PORT = 3000
+```

src/server.js

@@ -33,5 +33,6 @@ app.get('/', (req, res) => {
     res.render('index.ejs')
 })
 
-const port = process.env.PORT;
+const port = process.env.PORT || 3000;;
+
 app.listen(port, () => console.log("Server is running on http://localhost:%i", port));