added .env file with spotify secrets and dotenv package

.env.example

@@ -0,0 +1,4 @@
+// example of .env secrets file you need to have
+CLIENT_ID=xxx
+CLIENT_SECRET=xxx
+REDIRECT_URI=xxx

.gitignore

@@ -1,2 +1,3 @@
 node_modules
 .DS_Store
+.env

index.js

@@ -0,0 +1,14 @@
+require("dotenv").config();
+const express = require("express");
+
+const app = express();
+
+app.get("/", (req, res) => {
+  res.send("Hello World");
+});
+
+const PORT = 8888;
+
+app.listen(PORT, () => {
+  console.log(`Express is running at localhost:${PORT}`);
+});