Add license header

launcher/windows/main.cpp

@@ -1,3 +1,24 @@
+/*
+** novelWriter – Windows Launcher
+** ==============================
+**
+** This file is a part of novelWriter
+** Copyright (C) 2025 Veronica Berglyd Olsen and novelWriter contributors
+**
+** 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 3 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, see <https://www.gnu.org/licenses/>.
+*/
+
 #include <windows.h>
 #include <stdio.h>
 #include <tchar.h>