Technical documentation

[jcgruenhage]

I'm working on a bit of tooling around generating and backing up PGP keys, and I'd like the paper backup option to be compatible with paperkey, but I can't find any documentation on how the data is structured in the raw output, and how the encoding is handled etc. Does documentation like this exist already, and if not, is it planned to be added? I'd like to avoid making stuff up from the code if it can be avoided.