Learn to earn security challenge level 3

[DavidCox88]

I successfully managed to complete level 3 of the security challenge. I learnt a lot but though the challenge lab was a little bit easier than I was expecting. 

Ending up finishing 17 on both the level 2 and level 3 leader boards, looking forward to slots opening on level 1 as I missed out on it. #LearnToEarn!