Create onboarding checklists

[noahmanger]

To better socialize our policies, we should make on-boarding and off-boarding checklists. We think this will be easier for newcomers and make the policies more clear. (Moved over from https://github.com/18F/fec-accounts/issues/23)

[LindsayYoung]

Got that started here
https://docs.google.com/document/d/18ZjPvNrdW3wn9pUx7hSNbaMlaEaPPOGzOHh-WjLiVOg/edit#

[AmyKort]

This looks great! Are we ready to close this issue, with the understanding that we'll need to keep up our on-boarding document as our processes grow and change?

[LindsayYoung]

Yes! thanks Amy