Added docstring for documentation and usage example

py-scripts/test_fileio.py

@@ -1,5 +1,18 @@
 #!/usr/bin/env python3
 
+"""
+    This script will create a variable number of stations or macvlans to test fileio traffic. Pre-existing stations and
+    macvlans can be used as well. Command line options are available to update cross-connects as well as using a list of
+    existing cross-connects if desired. if none are given, cross-connects and endpoints will be created by the script.
+    Modes such as read-only, write-only, or both can be specified as well as ip addresses and starting numbers for sequential
+    stations or macvlans that are created in case of limited or pre-existing configurations. The test that is run during
+    this script will depend on the mode used, a read-only test will check the read-bps column, write-only will check write-bps
+    and both will check both columns. If the relevant columns increase over the duration of the test it will pass,
+    otherwise it will fail.
+
+    Use './test_fileio.py --help' to see command line usage and options
+"""
+
 import sys
 if sys.version_info[0] != 3:
     print("This script requires Python 3")