Feature: Add `lnk create` to create empty file or directory already added and tracked

[polymorcodeus]

Original intent was PR but abandoned with pending move to Rust.

Syntax will look different here:

# Example

# creates then add an empty directory to common with a .lnkkeep file to ensure it is tracked
lnk create ~/.config/awesome --dir

# creates then adds an empty file to personal host
lnk create ~/.conf/awesome/person.config --host personal`

This would shortcut needing to create the file in the normal directory and THEN add it. Really just a convenience to not have to open up a random IDE or vim session to edit files and can just "stay" in your lnk repo.