add copyright disclaimer

navigator/scripts/ls.py

@@ -1,5 +1,22 @@
 #!/usr/bin/env python3
 
+"""
+    Cockpit Navigator - A File System Browser for Cockpit.
+    Copyright (C) 2021 Josh Boudreau <jboudreau@45drives.com>
+
+    This file is part of Cockpit Navigator.
+    Cockpit Navigator 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.
+    Cockpit Navigator 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 Cockpit Navigator.  If not, see <https://www.gnu.org/licenses/>.
+"""
+
 import os
 from stat import S_ISDIR, filemode
 import json