Add alpine.js

Author: septatrix

README.md

@@ -227,6 +227,7 @@ A collection of awesome browser-side [JavaScript](https://developer.mozilla.org/
 * [Keo](https://github.com/Wildhoney/Keo) - Functional stateless React components with Shadow DOM support.
 * [atvjs](https://github.com/emadalam/atvjs) - Blazing fast Apple TV application development using pure JavaScript.
 * [makefun](https://www.npmjs.com/package/makefun) - Use promise values as they are satisfied otherwise wait for the promise
+* [Alpine.js](https://github.com/alpinejs/alpine) - offers you the reactive and declarative nature of big frameworks like Vue or React at a much lower cost.
 
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