[$] Just: a command runner

Over time, many Linux users wind up with a collection of aliases,
shell scripts, and makefiles to run simple commands (or a series of
commands) that are often used, but challenging to remember and
annoying to type out at length. The just command runner is a
Rust-based utility that just does one thing and does it well: it reads
recipes from a text file (aptly called a 'justfile'), and runs the
commands from an invoked recipe. Rather than accumulating a library
of one-off shell scripts over time, just provides a cross-platform tool
with a framework and well-documented syntax for collecting and
documenting tasks that makes it useful for solo users and
collaborative projects.