add cards documentation

src/modules/cards/dto/update-card.dto.ts

@@ -1,5 +1,33 @@
 import { PartialType } from '@nestjs/mapped-types'
+import { ApiProperty } from '@nestjs/swagger'
+import { IsOptional, Length } from 'class-validator'
 
 import { CreateCardDto } from './create-card.dto'
 
-export class UpdateCardDto extends PartialType(CreateCardDto) {}
+export class UpdateCardDto extends PartialType(CreateCardDto) {
+  @IsOptional()
+  @Length(3, 500)
+  question?: string
+
+  @IsOptional()
+  @Length(3, 500)
+  answer?: string
+
+  @IsOptional()
+  @Length(0, 0)
+  @ApiProperty({ type: 'string', format: 'binary' })
+  questionImg?: string
+
+  @IsOptional()
+  @Length(0, 0)
+  @ApiProperty({ type: 'string', format: 'binary' })
+  answerImg?: string
+
+  @IsOptional()
+  @Length(3, 500)
+  questionVideo?: string
+
+  @IsOptional()
+  @Length(3, 500)
+  answerVideo?: string
+}