Feature Request: Add support for tdf (terminal PDF viewer)

[Shawn-Summer]

A terminal-based PDF viewer.

Basic command: tdf

[lervag]

This is not immediately trivial, because we would need to control a new terminal in which to open tdf. This adds a layer of complexity that I'm not sure I want to go into.

You could use the general viewer with a command that opens a new terminal and immediately runs the tdf command, but I believe you would actually like something more "integrated".