split express app from index file to make testing easier

backend/src/server.ts

@@ -0,0 +1,15 @@
+import express from "express";
+import dotenv from "dotenv";
+import * as bodyParser from 'body-parser';
+
+import * as routes from "./routes"
+
+dotenv.config();
+
+const app = express();
+app.use(bodyParser.json());
+
+// Configure routes
+routes.register(app);
+
+export default app;