Add license header to org.jgrapht.alg.tour package-info

jgrapht-core/src/main/java/org/jgrapht/alg/tour/package-info.java

@@ -1,3 +1,21 @@
+/*
+ * (C) Copyright 2017-2024, by Dimitrios Michail and Contributors.
+ *
+ * JGraphT : a free Java graph-theory library
+ *
+ * See the CONTRIBUTORS.md file distributed with this work for additional
+ * information regarding copyright ownership.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0, or the
+ * GNU Lesser General Public License v2.1 or later
+ * which is available at
+ * http://www.gnu.org/licenses/old-licenses/lgpl-2.1-standalone.html.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR LGPL-2.1-or-later
+ */
+
 /**
  * Graph tours related algorithms.
  */