There should be a discoverable development roadmap

[exarkun]

It would be nice to have a development roadmap for Tahoe-LAFS. In fact, there is at least part of one which has been produced through discussion by the currently active contributors. However, it is mostly only present in the notes for project governance meetings.

Instead, it should be easy for someone new to the project to find a single canonical document from one of the obvious project documentation entrypoints.