Highlight special files.

[madelaney]

Using neo-tree, I'd like to call attention to some "special" files (i.e. Makefile / Cargo.toml / README.md / package.json ... etc). When I say call attention, either change the color of the file name, or bold/underline the file name ... something to draw eyes to those files to show they are more "important".

I looked over the docs and I wasn't able to find the current feature.