The major documents for the project are on Components list, but for clarity they're also listed here:

DocDesign
General documentation of the design and intended capabilities of DataWorkshop. Users should start with DocUserGuide instead.
DocImplementation
Documentation for developers, links to source code documentation and implementation specific notes, etc.
DocInstall?
Installation instructions.
DocUserGuide
Documentation for users, what DataWorkshop does and how to do it.