Done.

Added https://github.com/slimcoin-project/bip39, the instructions seem reasonably clear.

I don't know the 8th-level mage's spell of get-gh-to-use-a-nonstandard-index that Ian incanted in order to get the app to run under GH pages but I shall ask.

This one should download, open and run in the browser as a standalone HTML+JS app.

Cheers

Graham