feat: add transaction, card , and account entities

src/card/services/account.service.ts

@@ -0,0 +1,12 @@
+import { Injectable } from '@nestjs/common';
+import { Account } from '../entities/account.entity';
+import { AccountRepository } from '../repositories/account.repository';
+
+@Injectable()
+export class AccountService {
+  constructor(private readonly accountRepository: AccountRepository) {}
+
+  createAccount(accountId: string): Promise<Account> {
+    return this.accountRepository.createAccount(accountId);
+  }
+}