README

<!--info-header-start--><h1>Sudoku </h1><blockquote><p>by Bruno Ladeia <a href="https://github.com/BrunoLad" target="_blank">@BrunoLad</a></p></blockquote><p><a href="https://tsch.js.org/31797/play" target="_blank"></a> </p><!--info-header-end-->

Write a type that verifies Sudoku game is solved. This is based off a challenge from Advent of Typescript 2023 by TypeHero (Day 22). So kudos for them for thinking up such a neat challenge!

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