Update README.md

Author: a-pub

README.md

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 ### Code
 
+Theme supplied by A-Machine. 
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 Multi-format theme coding.
 
 <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-sa/4.0/88x31.png" /></a><br />This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">Creative Commons Attribution-ShareAlike 4.0 International License</a>.
 
 All software and code used is Free and Open Source Software. Respective open-source licences apply. Code by A-Machine is GPLv3 https://www.gnu.org/licenses/gpl-3.0.en.html 
 
+Vivliostyle Viewer is included in this repository for the purpose of design development previewing only. See respective [open source licences](/vivlio-dir/LICENSE.md). 
+
+Fidus Writer is used for authoring and outputting. Docsify is used for website generation.
+
 ### Development, design, and previewing
 
 Instructions for running locally for preview and design purposes https://github.com/a-machine/opd/wiki/Running-Design-Apps-As-Local