support patternfiles and multiple patterns like ripgrep.

[ItamarGronich]

Feature request

It would be nice to be able to supply multiple patterns or a path to a pattern file like ripgrep allows with the -f|--file flag.

Use case

I found myself in a problem where git status took 5 seconds to complete.
and it printed a message saying that it took 4.5 seconds to enumerate the untracked files in the repo.
so i wanted to use fd to list all the files i have untracked in git.

i could've done this easily if there was something like:

fd -u --glob --patternfile .gitignore

or

fd -u --globfile .gitignore

[tavianator]

Just for the record, you can use git ls-files --others to see all the untracked files in a repo