Advertise mimetype association to open the app from a file manager #76
Description
When you right-click PDF files in Nautilus and choose "Open with…", PDF Tricks is not listed among the "Recommended Apps", unlike Papers / Evince, Paper Clip and LibreOffice Draw.
It probably needs to explicitly state the PDF mimetypes it handles officially, probably in the .desktop file. See https://developer.gnome.org/documentation/guidelines/maintainer/integrating.html#mime-types
I see that there is no mention of mime in https://github.com/muriloventuroso/pdftricks/blob/master/data/com.github.muriloventuroso.pdftricks.desktop.in currently.
Of course, the app needs to be able to open those files when the files are provided to it externally / as an argument...