Added Richard Tallent to member list Annex A.1.
Update README.md
Reorganize gedcomx info
Update README.md
More models; begin use cases
Diagram of the data model
GitHub generates PNGs itself
Link to the diagram
Move all gedcomx content to one page
Add links to gedcomx table of contents
Remove "notes" headings from gedcomx model docs
Remove old gedcomx data type pages