add missing copyright
add missing copyright

SpectraLogic/ds3_net_sdk,shabtaisharon/ds3_net_sdk,SpectraLogic/ds3_net_sdk,shabtaisharon/ds3_net_sdk,RachelTucker/ds3_net_sdk,RachelTucker/ds3_net_sdk,shabtaisharon/ds3_net_sdk,SpectraLogic/ds3_net_sdk,RachelTucker/ds3_net_sdk