Added show/hide snippets

snippets/hide.md

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+### hide
+
+Hides all the elements specified.
+
+Use the spread operator (`...`) and `Array.forEach()` to apply `display: none` to each element specified.
+
+```js
+const hide = (...el) => [...el].forEach(e => e.style.display = 'none');
+```
+
+```js
+hide(document.querySelector('img')); // Hides all <img> elements on the page
+```

snippets/show.md

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+### show
+
+Shows all the elements specified.
+
+Use the spread operator (`...`) and `Array.forEach()` to clear the `display` property for each element specified.
+
+```js
+const show = (...el) => [...el].forEach(e => e.style.display = '');
+```
+
+```js
+show(document.querySelector('img')); // Shows all <img> elements on the page
+```