Add pre-commit justfile example

[blaggacao]

closes #637

[casey]

Looks good! Is the 00.justfile name intentional? Can it just be Justfile?

[blaggacao]

Jep it's intentional, if somebody comes along with another example, one day...
Maybe there might also be a more common topic than pre-commit where it could get denser, so I figured we should provide a non-semantic mechanism (ordinal) to account for multiple examples.

Do you think that's over-engineered?

[casey]

I think if there's another pre-commit example, it could go in pre-commit-foo/Justfile.

I'm actually really not sure if they should be in subdirectories at all. The reason I thought subdirectories would be good is so the actual file could be called Justfile, but it might be better to just have them be in examples, with a .just suffix, so examples/pre-commit.just, examples/automation.just, etc.

I think it's probably good to make the hierarchy more flat, and then add depth later as needed.

[blaggacao]

Agree!

[casey]

Awesome, looks great! Thanks for this, I think example justfiles will be a great addition to the docs. Soon, I'll add a link in the readme, and also add an integration test that makes sure that example justfiles always parse correctly.