docs: ani-cli matrix space application mechanism

Type of change

Enables a communication channel for ani-cli matrix space applications.

[ ] any anime playing
[ ] bumped version
[ ] next, prev and replay work
[ ] -c history and continue work
[ ] -d downloads work
[ ] -s syncplay works
[ ] -q quality works
[ ] -v vlc works
[ ] -e select episode works
[ ] -S select index works
[ ] -r range selection works
[ ] --skip ani-skip works
[ ] --skip-title ani-skip title argument works
[ ] --no-detach no detach works
[ ] --dub and regular (sub) mode both work
[ ] all providers return links (not necessarily on a single anime, use debug mode to confirm)
[ ] -h help info is up to date
[ ] Readme is up to date
[ ] Man page is up to date