BMISS-1:  Adding Missing functionality

There was a missing functionality to say good bye 10 times.
This pr fixes the issue.

[Jira BMISS-1 ](https://songchoe.atlassian.net/browse/BMISS-1 "Jira link")
[JenKin ](http://hrsabmistools.nih.gov:8000/ "JenKin")

## Description
#### HelloGitHub.java
Adding new function called sayGoodBye10Times().  This function beautifully uses System.out.println 10 times just like the ticket describes.  This is robust, as it will always print out 10 times!!


Status.
- [x] Jenkin is green
- [x] Code Review is finished
- [x] Manual testing is finished.