Add contributors file (#183)
Add contributors file (#183)

jspsych/jsPsych,shamrt/jsPsych,jodeleeuw/jsPsych,jspsych/jsPsych,wolfgangwalther/jsPsych,wolfgangwalther/jsPsych,shamrt/jsPsych,msrresearch/jsPsych,jspsych/jsPsych,jspsych/jsPsych