Add formatting

[Disservin]

@Sopel97 what do you say about adding some formatters?

black is also used for the wdl repo https://github.com/official-stockfish/WDL_model/tree/master, and the clang-format is taken from stockfish master

[Sopel97]

if we can get it to agree whether strings should be '' or "" I'm fine with it

[Disservin]

It uses double quotes " but some strings have double quotes inside them and use the opposite quotation characters. I.e. print('root_dir - the directory to "cleanup"'), this isn't automatically converted into a double quote because it'd need escaping.

[vondele]

I would also add a formatter, so if this can be rebased, let's merge.