feature/file-templates: add+polish license file templates

modules/feature/file-templates/templates/text-mode/__license-gpl3-bp

@@ -0,0 +1,21 @@
+# -*- mode: snippet -*-
+# name: GNU GPL 3.0 License (boilerplate)
+# uuid: __license-gpl3-bp
+# group: Licenses
+# contributor: https://choosealicense.com/licenses/lgpl-3.0
+# --
+${1:<program name and description>}
+Copyright (C) ${2:`(format-time-string "%Y")`} ${3:`user-full-name`}
+
+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 <http://www.gnu.org/licenses/>.