added a preliminary CODEOWNERS file
added a preliminary CODEOWNERS file

GoogleCloudPlatform/training-data-analyst,GoogleCloudPlatform/training-data-analyst,GoogleCloudPlatform/training-data-analyst,turbomanage/training-data-analyst,turbomanage/training-data-analyst,turbomanage/training-data-analyst,GoogleCloudPlatform/training-data-analyst,GoogleCloudPlatform/training-data-analyst,turbomanage/training-data-analyst,GoogleCloudPlatform/training-data-analyst,GoogleCloudPlatform/training-data-analyst,turbomanage/training-data-analyst,GoogleCloudPlatform/training-data-analyst,GoogleCloudPlatform/training-data-analyst,GoogleCloudPlatform/training-data-analyst,turbomanage/training-data-analyst,turbomanage/training-data-analyst,turbomanage/training-data-analyst,GoogleCloudPlatform/training-data-analyst