added creationDate to public work view

faircommons-services/common/src/main/lombok/eu/fairkom/faircommons/common/models/views/PublicWorkView.java

@@ -18,6 +18,7 @@ public class PublicWorkView {
     List<String> tags;
     String registrar;
     ZonedDateTime registrationDate;
+    ZonedDateTime creationDate;
     String publisher;
     String identifier;
     String language;