feat: add nestjs app (#172)

apps/nestjs/src/app.service.ts

@@ -0,0 +1,16 @@
+import { Inject, Injectable } from "@nestjs/common";
+
+import { DatabaseService } from "./db/database.service";
+
+@Injectable()
+export class AppService {
+  constructor(
+    // @ts-expect-error decorators are not correctly handled yet
+    @Inject(DatabaseService) private readonly databaseService: DatabaseService,
+  ) {}
+
+  async getHello(): Promise<string> {
+    const users = await this.databaseService.get().query.users.findMany();
+    return JSON.stringify(users);
+  }
+}