Merge pull request #443 from jgovea25/patch-1

Add note about CLA

Author: mlinksva

CONTRIBUTING.md

@@ -40,6 +40,8 @@ find it in the GitHub repository. Then click the `Edit` button. Make your
 changes, type in a commit message, and click the `Propose File Change` button.
 That’s it!
 
+You will be asked to sign the [GitHub Contributor License Agreement](https://cla.github.com/) for this project when you make your first pull request. 
+
 For more advanced changes, check out [the bootstrap instructions](https://github.com/github/choosealicense.com#run-it-on-your-machine) in the [project's readme](/README.md).
 
 ## Testing