feat: add file to start the server using express

Author: Victor

src/index.js

@@ -0,0 +1,7 @@
+import 'dotenv/config';
+import express from 'express';
+
+const app = express();
+const SERVER_PORT = process.env.SERVER_PORT;
+
+app.listen(SERVER_PORT, () => console.log(`Server is running! Port: ${SERVER_PORT}`));