As mentioned by James, there's some interest in writing quests, and I would certainly welcome it a lot if I didn't have to write them all by myself.
At this time, I can offer what's below and it is very, very rough. But maybe you can puzzle it out and make a quest or two, and if not at least let me know what exactly needs more details.
The basics is that every quest comes in two data files. They are both in YAML format. One contains all the texts (and can theoretically be translated, to provide quests in multiple languages) while the other contains all the technical information.
I will post an example quest below to demonstrate how it all works.
