* ppmtopgm: add page * Update pages/common/ppmtopgm.md Co-authored-by: Juri Dispan <juri.dispan@posteo.net> * Update pages/common/ppmtopgm.md Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com> --------- Co-authored-by: Juri Dispan <juri.dispan@posteo.net> Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>