adds MIT license to this porject

module/common/cli_parser.py

@@ -1,3 +1,11 @@
+# -*- coding: utf-8 -*-
+#  Copyright (c) 2020 Ricardo Bartels. All rights reserved.
+#
+#  netbox-sync.py
+#
+#  This work is licensed under the terms of the MIT license.
+#  For a copy, see file LICENSE.txt included in this
+#  repository or visit: <https://opensource.org/licenses/MIT>.
 
 import os