If you choose not to use a github repository for the parts you can create an fzpz file by the following (starting from a part in repository format):
rename the fzp file to part.name.fzp
test.fzp -> part.test.fzp
rename each of the 4 svg files to svg.layername.part.svg
test_1_breadboard.svg -> svg.breadboard.test_1_breadboard.svg
same for icon schematic and pcb svgs. Move them all to the same directory and zip (I use 7zip) the 5 files in to an fzp file:
part.test.fzp
svg.breadboard.part.svg
svg.icon.part.svg
svg.schematic.svg
svg.pcb.svg
as
part.fzpz
Now you can import (via open->part.fzpz in Fritzing) or post here in the forum. The Fritzing loader program converts the part. etc files in to repository format in an internal directory (the mine parts bin.) As far as I know this is not officially documented anywhere.
Peter