adds missing information (creation date) back to jpgs when exported from Apple Fotos
on osx: brew install exiftool
export images from Apple Fotos as Original with XMP sidecar, then
./addXMPtoJPG.sh /path/to/folder/with/jpgs/
it will go through all jpgs and write the xmp data from the xmp file back to the jpg (for example date created)