Add author

btrfs-decode-stream.py

 #! /usr/bin/env python
 # -*- coding: utf-8 -*-
+#
+# Decode Btrfs send stream
+#
+# Author: Jean-Denis Girard <jd.girard@sysnux.pf>
+#
 
 from struct import unpack
 from sys import argv, exit, stdin, stderr