Update CONTRIBUTING.md

Author: kkumar-gcc

CONTRIBUTING.md

@@ -9,7 +9,7 @@ Please note we have a code of conduct, please follow it in all your interactions
 
 1. Ensure any install or build dependencies are removed before the end of the layer when doing a 
    build.
-2. Update the README.md with details of changes to the interface, this includes new environment 
+2. Update the [README.md](README.md) with details of changes to the interface, this includes new environment 
    variables, exposed ports, useful file locations and container parameters.
 3. Increase the version numbers in any examples files and the README.md to the new version that this
    Pull Request would represent. The versioning scheme we use is [SemVer](http://semver.org/).