get https://api.ottolearn.io/v1/rest/leaderboard()/contest
List specific Leaderboard Contest. Each Contest object contains details of created and updated dates, Contest ID, Leaderboard ID having that contest, type of contest (draw or mostPoints), max winners, pointsRewardValue and contestRewardValue which are given to users on winning contest and the 'closed' flag to know whether the contest has been closed or not.