add licence to source file

src/packages/NotePad/main.coffee

@@ -1,3 +1,21 @@
+# Copyright 2017-2018 Xuan Sang LE <xsang.le AT gmail DOT com>
+
+# AnTOS Web desktop is is licensed under the GNU General Public
+# License v3.0, see the LICENCE file for more information
+
+# 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/.
+
 class NotePad extends this.OS.GUI.BaseApplication
     constructor: ( args ) ->
         super "NotePad", args