add crete/get cards

src/modules/cards/use-cases/get-deck-by-id-use-case.ts

@@ -0,0 +1,15 @@
+import { CommandHandler, ICommandHandler } from '@nestjs/cqrs'
+import { CardsRepository } from '../infrastructure/cards.repository'
+
+export class GetDeckByIdCommand {
+  constructor(public readonly id: string) {}
+}
+
+@CommandHandler(GetDeckByIdCommand)
+export class GetDeckByIdHandler implements ICommandHandler<GetDeckByIdCommand> {
+  constructor(private readonly deckRepository: CardsRepository) {}
+
+  async execute(command: GetDeckByIdCommand) {
+    return await this.deckRepository.findDeckById(command.id)
+  }
+}