Update activity.js
Update activity.js

Adding 'while' block
tchx84/turtleblocksjs,Daksh/turtleblocksjs,i5o/turtleblocksjs,tradzik/turtleblocksjs,tchx84/turtleblocksjs,rodibot/turtleblocksjs,garyservin/turtleblocksjs,garyservin/turtleblocksjs,i5o/turtleblocksjs,tradzik/turtleblocksjs,rodibot/turtleblocksjs,tchx84/turtleblocksjs,hemantkasat/turtleblocksjs,garyservin/turtleblocksjs,rodibot/turtleblocksjs,walterbender/turtleblocksjs,hemantkasat/turtleblocksjs,i5o/turtleblocksjs,Daksh/turtleblocksjs,tradzik/turtleblocksjs,hemantkasat/turtleblocksjs,walterbender/turtleblocksjs,Daksh/turtleblocksjs,walterbender/turtleblocksjs