[centrality] added and updated the license for edge_cases.pg

pgtap/metrics/betweennessCentrality/edge_cases.pg

@@ -1,3 +1,22 @@
+/*PGR-GNU*****************************************************************
+
+Copyright (c) 2024  pgRouting developers
+Mail: project@pgrouting.org
+
+------
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ ********************************************************************PGR-GNU*/
+
 BEGIN;
 
 UPDATE edges SET cost = sign(cost), reverse_cost = sign(reverse_cost);