Updated README

Author: swapnanildutta

README.md

@@ -1,4 +1,15 @@
 [![HitCount](http://hits.dwyl.com/swapnanildutta/Hackerrank-Codes.svg)](http://hits.dwyl.com/swapnanildutta/Hackerrank-Codes)
 [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](http://makeapullrequest.com) 
 # Hackerrank-Codes
-Here are some of the hackerrank questions I solve. 
+
+Here are some of the HackerRank Codes. Please try them by yourself and then check them out. These are just to help you understand better.
+
+## For Contributing
+
+For contributing, please follow the following instructions :
+
+- While uploading a new piece of code, please mention the HackerRank Question to which that code is being submitted and comment out the question.
+- Create a pull request with the name of the file you want to add or change, specifying the changes you made.
+- Add working codes. Please !
+- Raise an issue whenever you find something incorrect.
+- Always update the README when you upload a new file.