Document import/recommended

[edemaine]

I learned about the ruleset import/recommended from reading the CHANGELOG, but it's not in the README. Presumably it should replace all the examples that use import/errors and import/warnings? (though those rulesets should also be mentioned once)

[ljharb]

Unfortunately recommended rulesets in plugins aren’t often up to date with what’s recommended, because of semver constraints. It should be mentioned, but not encouraged.

[edemaine]

@ljharb Is there a different source for "what's recommended"? I couldn't find anything in the documentation besides import/errors and import/warnings.

[ljharb]

Not really, no - but I’d suggest the Airbnb config.