UI content documentation

[dazzaji]

• See: https://github.com/alexfigtree/CoreID/tree/master/src
• Overall architectural documentation includes: user flow, UI content, key use cases, data model and conceptual architecture for analytics

[alexfigtree]

Documentation has been written up in UI_Content.md, seen here: https://github.com/alexfigtree/CoreID/blob/master/docs/UI_Content.md