feat: add nestjs app (#172)

apps/nestjs/src/db/database.service.ts

@@ -0,0 +1,10 @@
+import { Injectable } from "@nestjs/common";
+
+import { db } from "@homarr/db";
+
+@Injectable()
+export class DatabaseService {
+  get() {
+    return db;
+  }
+}