feat: add nestjs app (#172)

apps/nestjs/src/app.module.ts

@@ -0,0 +1,12 @@
+import { Module } from "@nestjs/common";
+
+import { AppController } from "./app.controller";
+import { AppService } from "./app.service";
+import { DatabaseService } from "./db/database.service";
+
+@Module({
+  imports: [],
+  controllers: [AppController],
+  providers: [DatabaseService, AppService],
+})
+export class AppModule {}