Added hasClass/toggleClass snippets

snippets/toggleClass.md

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+### toggleClass
+
+Toggle a class for an element.
+
+Use `element.classList.toggle()` to toggle the specified class for the element.
+
+```js
+const toggleClass = (el, className) => el.classList.toggle(className);
+```
+
+```js
+toggleClass(document.querySelector('p.special')[0],'special') // The paragraph will not have the 'special' class anymore
+```