Implementaiton of preview tab.

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

@@ -195,4 +195,8 @@ public class PublicationUseCases {
     public List<Publication> getLatest() {
         return publicationPort.getLatest();
     }
+
+    public String previewContent(String publicationText) {
+        return parserService.parse(publicationText);
+    }
 }