Add countVowels

snippets/countVowels.md

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+### countVowels
+
+Retuns `number` of vowels in provided string.
+
+Use a regular expression to count number of vowels `(A, E, I, O, U)` in a `string`.
+
+```js
+const countVowels = str =>
+  return (str.match(/[aeiou]/ig) || []).length;
+// countVowels('foobar') -> 3
+// countVowels('gym') -> 0
+```