README.Ko

<!--info-header-start--><h1>Flatten </h1><blockquote><p>by zhouyiming <a href="https://github.com/chbro" target="_blank">@chbro</a></p></blockquote><p><a href="https://tsch.js.org/459/play/ko" target="_blank"></a> &nbsp;&nbsp;&nbsp;<a href="./README.md" target="_blank"></a> <a href="./README.zh-CN.md" target="_blank"></a> <a href="./README.ja.md" target="_blank"></a> </p><!--info-header-end-->

주어진 배열을 플랫한 배열 타입으로 바꾸는 Flatten 타입을 구현하세요.

예시:

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