regen-registry-program-guide (WIP Readme)

This readme should be more fully upated prior to marking this PR as open.

Overview of AsciiDoc

AsciiDoc is a lightweight and semantic markup language primarily designed for writing technical documentation. The language can be used to produce a variety of presentation-rich output formats, all from content encoded in a concise, human-readable, plain text format.

In the context of the Regen Registry Program Guide, we use a small subset of the features of AsciiDoc, which are documented here:

• =, == for headings & subheadings
• :sectnums: and :sectnumlevels: to enable decimal-outline notation for section headings
• :toc: to auto-generate a table of contents
• ., .. for ordered lists
• -, * for un-ordered lists
• indentation of ordered & unordered lists do not affect rendering, and are done only to make the plain-text easier to read
• footnote: keyword is used to generate footnotes
• |=== to create basic tables
• http://foo.bar[My website] for rendering links
• Term:: for definitions & term descriptions
• <<Section Title>> for links between different sections