fix: backend build

Signed-off-by: Mirko Mollik <mirkomollik@gmail.com>

apps/holder-backend/src/app/credentials/dto/create-credential.dto.ts

@@ -0,0 +1,28 @@
+import {
+  CredentialConfigurationSupported,
+  MetadataDisplay,
+} from '@sphereon/oid4vci-common';
+import { IsObject, IsString } from 'class-validator';
+
+export class CreateCredentialDto {
+  /**
+   * The id of the credential
+   */
+  @IsString()
+  id: string;
+
+  /**
+   * JSON based credential
+   */
+  @IsString()
+  value: string;
+
+  /**
+   * Metadata of the credential
+   */
+  @IsObject()
+  metaData: CredentialConfigurationSupported;
+
+  @IsObject()
+  issuer: MetadataDisplay;
+}