Add compactWhitespace snippet

snippets/compactWhitespace.md

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+### compactWhitespace
+
+Returns a string with whitespaces compacted.
+
+Use `String.prototype.replace()` with a regular expression to replace all occurences of 2 or more whitespace characters with a single space.
+
+```js
+const compactWhitespace = str => str.replace(/\s{2,}/g,' ');
+```
+
+```js
+compactWhitespace('Lorem    Ipsum'); // 'Lorem Ipsum'
+compactWhitespace('Lorem \n Ipsum'); // 'Lorem Ipsum'
+```