add table of timings

[pengowray]

Self-check

• The changes are tested against the contribution checklist

I can't do math in my head and thought maybe some other players would appreciate a simple table of hit window timings too. It might also be good to also add the same table to https://osu.ppy.sh/wiki/en/Beatmap/Overall_difficulty

[github-actions]

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[TicClick]

this is a change that needs to be propagated to translations later on -- please don't use SKIP_OUTDATED_CHECK in your PR's description