Add 'pxt uploadfile' command
Add 'pxt uploadfile' command

playi/pxt,switch-education/pxt,switchinnovations/pxt,playi/pxt,switch-education/pxt,switchinnovations/pxt,switch-education/pxt,switch-education/pxt,switchinnovations/pxt,Microsoft/pxt,switch-education/pxt,playi/pxt,Microsoft/pxt,Microsoft/pxt,playi/pxt,Microsoft/pxt,Microsoft/pxt,switchinnovations/pxt