Implementation of getting publication by its id.

codiki-application/src/main/java/org/codiki/application/publication/PublicationUseCases.java

@@ -3,6 +3,7 @@ package org.codiki.application.publication;
 import static java.util.Objects.isNull;
 import java.time.Clock;
 import java.time.ZonedDateTime;
+import java.util.Optional;
 import java.util.UUID;
 
 import static org.codiki.domain.publication.model.builder.AuthorBuilder.anAuthor;
@@ -153,4 +154,8 @@ public class PublicationUseCases {
 
         publicationPort.delete(publicationToDelete);
     }
+
+    public Optional<Publication> findById(UUID publicationId) {
+        return publicationPort.findById(publicationId);
+    }
 }