add header

src/TextOffset.h

@@ -1,3 +1,21 @@
+// grepWin - regex search and replace for Windows
+
+// Copyright (C) 2024 - Stefan Kueng
+
+// 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,
+// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+//
 #pragma once
 #include <atomic>
 #include <vector>