[Feature Request][CMD Operation] Can we mux 2 subtitles into one subtitle with just a command?

[sihunqu123]

I know we can do it via GUI. But it would be much more convenient if we can do it via CMD. e.g.

java -jar dualsub.jar --input-subtitle1 1.srt --input-subtitle2 2.srt --output-subtitle muxed.srt

Thanks, for your nice project.