Add Unibeautify to beautifiers and formaters

[Marvin Heilemann]

Here is the link to the project: https://unibeautify.com/

Because it is very universal I would recommend put it on the top.

[Benjamin Lannon]

Feel free to push a PR adding the extension to the list (I'm guessing this one: https://github.com/Unibeautify/vscode), and we will look it over 😄