#1 added index.ts + checkhealth

src/controllers/healthCheck.ts

+import express, { Router, Request, Response } from 'express'
+
+export class HealthCheckController {
+    private router: Router
+
+    constructor() {
+        this.router = express.Router()
+        this.router.get('/', this.checkHealth)
+    }
+
+    public getRouter = (): Router => {
+        return this.router
+    }
+    
+    private checkHealth = (req: Request, res: Response): void => {
+        res.send('Server is OK')
+    }
+}

src/index.ts

 import express, { Express } from "express";
 import dotenv from 'dotenv';
 import cors from 'cors';
+import { HealthCheckController } from "./controllers/healthCheck";
 
 dotenv.config()
 
@@ -12,4 +13,19 @@ class App {
         this.app.use(express.static('public'))
         this.app.use(cors())
     }
+
+    public init = async(): Promise<void> => {
+        try{
+            this.app.use('/health-check', new HealthCheckController().getRouter())
+            this.app.listen(process.env.APP_PORT, () => {
+                console.log(`Server is running on port ${process.env.APP_PORT}`)
+            })
+        } catch(err: unknown){
+            console.log(err); 
+        }
+    }
 }
+
+const app = new App();
+
+app.init();
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