addCheckboxControl()

addCheckboxControl('thisLayer/master','name',0/1);

thisLayer / master

thisLayer referrers to the layer itself master referrers to the master layer in the comp

name

name referrers to the name you would like to give the effect

0/1

0/1 referrers to the value of the effect: 0 = false / unticked 1 = true / ticked