Add README; introduce jm-mainbody subdir.

README.md

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+# sa2019-sitesnips
+Space Access 2019 website snippets
+
+This repo is intended as an aide for developing the website at:
+https://sa2019.erps.org
+The website is built using Joomla.
+
+## Source materials
+
+Source material comes from these pages:
+* http://space-access.org/
+* http://space-access.org/updates/sa2019prog.html -
+  particularly the section "Preliminary SA2019 Conference Agenda"
+
+## jm-mainbody
+
+This subdirectory includes raw HTML fragments which can be
+manipulated through the Joomla editor interface.
+It includes the main body of a page, but not the sidebars.
+
+Content is added by a site administrator in a rich text editing window.
+One of the editor options is "tinyMCE", and includes a raw HTML mode.
+It is thus possible to craft raw HTML snippets offline and copy them in.
+
+As currently saved in this repository,
+HTML lines are broken to wrapper structures (including style in tag) and internal content.
+The idea was to make changes trackable.
+
+Once saved by the Joomla editor (in this case, tinyMCE),
+the wrapper structure disappears,
+resulting in single-line paragraphs and list items.
+As yet, those single lines have not been copied back to this repo
+over concern of degrading the ability to track changes.
+