[Openid-specs-mobile-profile] Issue #51: High-level overview of account porting message flow (openid/mobile)

[James Manger]

New issue 51: High-level overview of account porting message flow
https://bitbucket.org/openid/mobile/issues/51/high-level-overview-of-account-porting

James Manger:

Give a high-level overview on the message flow among user, RPs, new and old OP in the beginning of the document, e.g. after section 1.

Responsible: james_manger_telstra