add placeholder ilios_preferences.js file in preparation for refactor
add placeholder ilios_preferences.js file in preparation for refactor

thecoolestguy/ilios,justinchu17/ilios,ilios/ilios,Trott/ilios,stopfstedt/ilios,thecoolestguy/ilios,Trott/ilios,justinchu17/ilios,justinchu17/ilios,stopfstedt/ilios,ilios/ilios,justinchu17/ilios,dartajax/ilios,dartajax/ilios