Add 'READMA.md'

READMA.md

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+## Reminder
+
+After cloning this repo, the themes (which are configured as `git submodules`) won't automatically also clone.  This will almost certainly cause the site not to render!
+
+To bring down the theme(s), issue the following from the repo root dir:
+
+```
+git submodule init
+git submodule update
+```
+HTH