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.

Do we have any information about how the data czar sets up these keys? Even something like "The data czar works with *person/institution X*" would be helpful.

Also, I would say "The data czar... sets up two encryption "keys", a public key and a private key, for securely transferring files..."