[tei-council] chaining for idiots

As promised, here's an initial draft for a tutorial on how to chain ODDs together. Thanks to James and Hugh for patient and helpful input during its composition. No thanks at all to SNCF for causing me to lose half of the first draft by braking suddenly on the train here on Friday. But above all thanks to everyone on Council who takes time to give it a quick read and makes suggestions for topics as yet uncovered, or covered inadequately! readable (ish) version: http://teic.github.io/TCW/howtoChain.html source : https://raw.githubusercontent.com/TEIC/TEI/dev/Documents/pureODD/howtoChain....