configured base route and setup healthcheck endpoint

src/app.controller.ts

@@ -1,12 +1,7 @@
 import { Controller, Get } from '@nestjs/common';
-import { AppService } from './app.service';
 
 @Controller()
 export class AppController {
-  constructor(private readonly appService: AppService) { }
-
-  @Get()
-  getHello(): string {
-    return this.appService.getHello();
-  }
+  @Get('health')
+  health(): void { }
 }