Adding java doc

application/module-certificate/src/main/java/org/fuseri/modulecertificate/service/ApiError.java

@@ -4,6 +4,10 @@ import org.springframework.http.HttpStatus;
 
 import java.time.LocalDateTime;
 
+/**
+ * @author Michal Badin - Formula 1 team
+ */
+
 public class ApiError {
 
     private LocalDateTime timestamp;