Added Swagger and TypeORM, added Hello World

src/app.controller.ts

@@ -1,12 +1,15 @@
 import { Controller, Get } from '@nestjs/common';
 import { AppService } from './app.service';
+import { Query, Resolver } from '@nestjs/graphql';
 
 @Controller()
+@Resolver()
 export class AppController {
   constructor(private readonly appService: AppService) {}
 
-  @Get()
-  getHello(): string {
+  @Query(()=>String)
+  @Get("/")
+  hello(): string {
     return this.appService.getHello();
   }
 }