added instruction for launching the script

Author: Singh Vijendra (BEG/EOR2)

README.md

@@ -6,6 +6,10 @@
 ## About
 A sample socket programming in python using low level networking interface module [socket](https://docs.python.org/3.3/library/socket.html). 
 
+## Instructions
+* Run server first and then client.
+* To close connection, give keyboard interrupt to client, server will close automatically.
+
 ## Features
 You will find follwing on top of vanilla implementation you find in any first tutorial link you get from googling:
 * Allowing communication with trusted client only, check using first received message from client as key message