README

<!--info-header-start--><h1>Replace First </h1><blockquote><p>by George Flinn <a href="https://github.com/ProjectFlinn" target="_blank">@ProjectFlinn</a></p></blockquote><p><a href="https://tsch.js.org/25170/play" target="_blank"></a> </p><!--info-header-end-->

Implement the type ReplaceFirst<T, S, R> which will replace the first occurrence of S in a tuple T with R. If no such S exists in T, the result should be T.

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