Ahodges/documentation/doc158

@WatsonEmily please share with PMs who have worked through this process with data czars before... I'd love to get their feedback on level of detail and completeness.
@rocha and @stroilova , please let me know if this information is accurate (or designate others in Analytics).
@mhoeber and @srpearce , your feedback always welcome.

Since we can't use gerunds, this format expressed the action that data czars take in creating credentials, as distinct from the action that edX takes in creating other credentials. I will work on changing bith.