Add copyright headers

Author: marschall

src/test/java/org/eclipse/yasson/Issue586Test.java

@@ -1,3 +1,15 @@
+/*
+ * Copyright (c) 2023 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0,
+ * or the Eclipse Distribution License v. 1.0 which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+ */
+
 package org.eclipse.yasson;
 
 import static org.junit.jupiter.api.Assertions.assertFalse;
@@ -18,6 +30,8 @@
 
 /**
  * Verify Jsonb leaves the streams open.
+ *
+ * @author Philippe Marschall
  */
 public class Issue586Test {