add decks documentation

src/modules/cards/entities/cards.entity.ts

@@ -1 +1,20 @@
-export class Card {}
+import { Pagination } from '../../../infrastructure/common/pagination/pagination.dto'
+
+export class Card {
+  id: string
+  deckId: string
+  userId: string
+  question: string
+  answer: string
+  shots: number
+  answerImg: string
+  questionImg: string
+  rating: number
+  created: Date
+  updated: Date
+}
+
+export class PaginatedCards {
+  items: Card[]
+  pagination: Pagination
+}