Added contructor that takes message and http status as params (#336).

src/main/java/org/gitlab4j/api/GitLabApiException.java

@@ -37,6 +37,18 @@ public class GitLabApiException extends Exception {
         this.message = message;
     }
 
+    /**
+     * Create a GitLabApiException instance with the specified message and HTTP status code.
+     *
+     * @param message the message for the exception
+     * @param httpStatus the HTTP status code for the exception
+     */
+    public GitLabApiException(String message, int httpStatus) {
+        super(message);
+        this.message = message;
+        this.httpStatus = httpStatus;
+    }
+
     /**
      * Create a GitLabApiException instance based on the ClientResponse.
      *