Where do I stick development documentation?

There's some documentation aimed at developing that I'd like to see / write in Git at some point.

Developing:

   * How to work with Gettext

   * How to write portable code, i.e. constructs to avoid in C / shell
     script etc (these keep coming up).

Translators:

   * How to deal with gettext / submit po files / keep them up to date
     etc.

   * Core git concepts (that need to be translated), maybe I could
     adopt the gitglossary to this task, but it'd need to be a bit
     more structured, i.e. describe core data concepts first, then
     some other terms.

     Actually, on that point, do we have documentation that describes
     git's data model in one place? I.e. everything from blobs to
     trees, how raw commit objects etc. look. Something like "Git for
     computer scientists".

The problem is that I don't know where to put these. I like idea of them being man pages, maybe gitdev-gettext.txt, gitdev-code-portable.txt or something like that?

The only thing like that currently it Documentation/{SubmittingPatches,CodingGuidelines} and t/README.