added id and description to artifact model

Author: dwasinge

src/main/java/com/redhat/labs/lodestar/models/Artifact.java

@@ -11,7 +11,9 @@
 @AllArgsConstructor
 public class Artifact {
 
+    private String id;
     private String title;
+    private String description;
     private String type;
     private String linkAddress;