add copyright disclaimer

makefile

@@ -1,3 +1,18 @@
+# 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/>.
+
 default: