add some documentation to concourse.thrift
add some documentation to concourse.thrift

kylycht/concourse,cinchapi/concourse,vrnithinkumar/concourse,hcuffy/concourse,dubex/concourse,vrnithinkumar/concourse,remiemalik/concourse,remiemalik/concourse,dubex/concourse,cinchapi/concourse,vrnithinkumar/concourse,JerJohn15/concourse,hcuffy/concourse,JerJohn15/concourse,dubex/concourse,kylycht/concourse,hcuffy/concourse,JerJohn15/concourse,hcuffy/concourse,hcuffy/concourse,JerJohn15/concourse,JerJohn15/concourse,cinchapi/concourse,kylycht/concourse,JerJohn15/concourse,dubex/concourse,remiemalik/concourse,kylycht/concourse,remiemalik/concourse,remiemalik/concourse,cinchapi/concourse,kylycht/concourse,hcuffy/concourse,cinchapi/concourse,vrnithinkumar/concourse,vrnithinkumar/concourse,remiemalik/concourse,cinchapi/concourse,dubex/concourse,kylycht/concourse,dubex/concourse,vrnithinkumar/concourse