Files would go in tdebase/kcontrol/autostart/ Copy a CMakeLists.txt file from any other folder in the tdebase/kcontrol/ directory into your new tdebase/kcontrol/autostart/ directory. Then edit tdebase/kcontrol/autostart/CMakeLists.txt so that the source file names, .desktop file name, and library name are all correct for the new autostart module. Finally, edit tdebase/kcontrol/CMakeLists.txt and add a new line "add_subdirectory( autostart )" where it makes sense.
Ok. Thanks. Yet Another Side Project!
Darrell