Added git ignore file
Added git ignore file

avatao/challenge-engine,avatao/challenge-engine,avatao/challenge-engine,avatao/challenge-engine,avatao/challenge-engine,avatao-content/challenge-toolbox,avatao-content/challenge-toolbox,avatao-content/challenge-toolbox,avatao-content/challenge-toolbox,avatao/challenge-engine,avatao/challenge-engine,avatao-content/challenge-toolbox,avatao-content/challenge-toolbox,avatao-content/challenge-toolbox,avatao-content/challenge-toolbox,avatao-content/challenge-toolbox,avatao/challenge-engine