FR: document tmux -CC with iTerm2

[Kyslik]

I'm Submitting a ...

• [x] Tool/language/etc documentation request

Tool/Language/etc

Basic usage

• install tmux on your server (or on your localhost using brew)
• ssh to the box and run tmux -CC command

more info can be found at:

• https://gitlab.com/gnachman/iterm2/wikis/TmuxIntegration

[simeg]

Tmux is awesome.

[chongdae]

For tmux integration,

• https://gitlab.com/gnachman/iterm2/-/wikis/tmux-Integration-Best-Practices

is more helpful.