Added docstring for documentation and usage example

py-scripts/test_ipv4_l4_wifi.py

@@ -1,5 +1,13 @@
 #!/usr/bin/env python3
 
+"""
+    This script will create a variable number of stations that will attempt to use layer 4 endpoints to generate traffic.
+    A test will run for a specified amount of time with periodic checks for traffic successfully being received. The test will
+    monitor the bytes-rd column of the endpoints. An increase at every test interval will pass the test, otherwise it will fail
+
+    Use './test_ipv4_l4_wifi.py --help' to see command line usage and options
+"""
+
 import sys
 
 if sys.version_info[0] != 3: