Added selectedChallenge and chosenChallenges.
Added selectedChallenge and chosenChallenges.

freeCodeCamp/arcade-mode,kevinnorris/arcade-mode,kevinnorris/arcade-mode,freeCodeCamp/arcade-mode,freeCodeCamp/arcade-mode,kevinnorris/arcade-mode,kevinnorris/arcade-mode,freeCodeCamp/arcade-mode