[tei-council] pure odd doc

As promised, I've now updated my little tutorial on pure ODD. A PDF version is attached, and you can find the source in the repo at https://github.com/TEIC/TEI/blob/dev/Documents/pureODD/pureODDtutorial.xml : I am wondering if it needs a section on "how to convert your existing odd", which would however be much easier to write with input from some early adopters... (that's you chaps) If you sniff around in that bit of the repo, you'll also find a more ambitious document by Sebastian called "The TEI Customisation Handbook" ( https://github.com/TEIC/TEI/blob/dev/Documents/oddmanual/oddmanual.xml) This was written some time ago and doesn't therefore discuss pure odd. I haven't yet had the heart to bring it up to date.