D7382: add markdown support

[Julian Wolff]

progwolff added a comment.


  F3867164: okularmd.png <https://phabricator.kde.org/F3867164>

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D7382

To: progwolff, #okular
Cc: aacid