docs: add README

README.md

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+# Every element is an HTML.
+
+Click on anything to make everything else on the page that element.
+
+Inspired by All HTML ([website](https://esoteric.codes/blog/all-html) and [Esoteric.Codes writeup](https://esoteric.codes/blog/all-html)) and [The Angle Bracket](https://theanglebracket.com/) by Laurie Voss.
+
+Resources used include [TutorialRepublic](https://www.tutorialrepublic.com/html-reference/html5-tags.php), [W3Schools](https://www.w3schools.com/cssref/css_default_values.asp), and, of course, [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/Element).