1st draft: N'Ko layout requirements FOR REVIEW

I just uploaded a first draft of N'Ko Layout Requirements, which i'd 
like to move to First Public Working Draft on the NOTE track after review.

Please could you take a look and let me know what changes are needed?

https://w3c.github.io/afrlreq/nko/

thanks,
ri



The material in this draft is a set of extracts from the document N’Ko 
script orthography notes at https://r12a.github.io/scripts/nkoo/nqo.html