Indicate font is WIP in readme

[Balearica]

It looks like this font is still in very early stages of development, to the point of not being usable yet. If this is the case, can you add a note at the top of the readme indicating this? This project shows up in search results when looking for alternatives to Plantin, and the readme makes it seem like the fonts already exist in some form (claiming "Regular, Bold, Italic, Bold Italic" styles are included).