Update README.md

Author: rdbartlett

README.md

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+# Apr 28 2023 Update
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+This is a snapshot of where the Handbook was, before we did the major upgrade in 2023. It's saved here as an archive.
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+
 # Introduction
 
 If you're looking for introductory information about Enspiral, check our website [enspiral.com](http://enspiral.com/), [this quick slideshow](http://whatis.enspiral.com), or [this 90 second video](https://vimeo.com/125088390).