#1 added linksRouter

backend/src/index.ts

 import express, {Express} from 'express';
+import {linksRouter} from './routes/linksRouter';
 
 const app: Express = express();
-// app.use
+app.use(express.json());
+app.use('/links', linksRouter);
+
+app.listen(3000, () => {
+  console.log(`Server is listening on port 3000`);
+});

backend/src/routes/linksRouter.ts

+import express, {Router, Request, Response} from 'express';
+
+export const linksRouter: Router = express.Router();
+
+linksRouter.get('/', (req: Request, res: Response) => {
+  res.send('Hello');
+});
+
+linksRouter.post('/', (req: Request, res: Response) => {
+  res.send('Hello');
+});