add Procfile.dev for development executables
add Procfile.dev for development executables

adoosii/classroom,chengjunjian/classroom,mostlybadfly/classroom,guoyu07/classroom,nfeliciano/classroom,bhanuc/classroom,jingruoruchu/classroom,jasnow/classroom,ConnorCartwright/classroom,hackerkid/classroom,bhanuc/classroom,ConnorCartwright/classroom,chengjunjian/classroom,mkcode/classroom,bhanuc/classroom,tjhorner/classroom,jasnow/classroom,adoosii/classroom,mkcode/classroom,jingruoruchu/classroom,jingruoruchu/classroom,RyanTech/classroom,mostlybadfly/classroom,mkcode/classroom,alejandrogarciasalas/classroom,tjhorner/classroom,tjhorner/classroom,chenwenbin928/classroom,jasnow/classroom,chengjunjian/classroom,alejandrogarciasalas/classroom,chenwenbin928/classroom,hackerkid/classroom,BelieveC/classroom,mostlybadfly/classroom,BelieveC/classroom,adoosii/classroom,alejandrogarciasalas/classroom,RyanTech/classroom,hackerkid/classroom,guoyu07/classroom,guoyu07/classroom,nfeliciano/classroom,nfeliciano/classroom,RyanTech/classroom,chenwenbin928/classroom,ConnorCartwright/classroom,BelieveC/classroom,BelieveC/classroom