Update the readme to clarify the goals and non-goals of this package

[devoncarew]

goals: supporting a recommendation for a core and recommended set of lints
non-goals: recommendations past that (e.g., 'strict')

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In order to better make the community aware of linting sets beyond the recommended one here, we could consider listing commonly used community lint sets.

[parlough]

In order to better make the community aware of linting sets beyond the recommended one here, we could consider listing commonly used community lint sets.

I mentioned this in #792, but:

As for your mention of the community lint sets, we could consider suggesting use of a standard lints or linter-rules pub topic and linking to that topic.

That would allow for an easy consistent link and any extra filtering or sorting they would like.

[devoncarew]

we could consider suggesting use of a standard lints or linter-rules pub topic and linking to that topic

Great idea! That would help w/ discovery of lints sets.