Add copyright header

Author: remingtonc

src/cisco_gnmi/cli.py

@@ -1,7 +1,30 @@
 #!/usr/bin/env python
+"""Copyright 2020 Cisco Systems
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+The contents of this file are licensed under the Apache License, Version 2.0
+(the "License"); you may not use this file except in compliance with the
+License. You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+License for the specific language governing permissions and limitations under
+the License.
 """
-Wraps gNMI RPCs with a reasonably useful CLI for interacting with network elements.
 
+"""
+Wraps gNMI RPCs with a reasonably useful CLI for interacting with network elements.
+Supports Capabilities, Subscribe, Get, and Set.
 
 Command parsing sourced from this wonderful blog by Chase Seibert
 https://chase-seibert.github.io/blog/2014/03/21/python-multilevel-argparse.html