Update README.md

README.md

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 Solo is an affordable security key that implements FIDO2/U2F and supports USB, NFC, and extensions.  Extensions
 include SSH, GPG, and cryptocurrency.  Solo is an upgrade to [U2F Zero](https://github.com/conorpp/u2f-zero) and is a work in progress.
 
+> Technical documentation for this project is contained in [docs/](https://github.com/SoloKeysSec/solo/tree/master/docs), built with [MkDocs](https://solo.solokeys.io/documenting/) and deployed automatically to <https://solo.solokeys.io>.
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 ![](https://i.imgur.com/cXWtI1D.png)
 ![](https://i.imgur.com/vwFbsQW.png?1)