See doc/Readme.txt for the real readme. This file just lists some quick information about what's here...

mde/            The source directory.
data/           Some data files, plus some base configuration data (user-
                configuration should be stored in ~/.config/mde on UNIX systems
                and ./user on Windows (needs fixing); see
                codeDoc/resource/paths.txt for further info).
user/           Windows only user-config (see above note).
bin/            This directory contains executables/other binaries. It must
                exist for compiling (but should be auto-created).
doc/            Some basic information.
codeDoc/        Documentation aimed mostly at developers. The directory
                structure roughly corresponds to that under mde/.
test/           Source code for testing programs.
util/           Source code for utility programs.
dsss_objs/      Compiled object files. Delete if you like.
dsss.conf       The build-time configuration.