Added laus0006 to p9 & p10

Pull request for the project here: https://github.com/kism3t1/java-game/pull/7
P9:
Since I was looking at someones game, it was impossible to create a unit/integration test, so I did something similar to prac 3 with a test plan, located at:
https://github.com/laus0006/java-game/blob/master/test_plan.md
This was submitted as part of the pull request.
P10:
Fixed issue with UI on negative health, and added functionality to return to the menu when health reaches 0.
See the pull request, or commits here: https://github.com/laus0006/java-game/commits/master
The test plan was updated to reflect the test that now passes.