adding function that make a new array containing every nth element of a given array.

snippets/take-every-nth-element.md

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+### Take every nth element of an array
+
+Use `Array.filter()` to create a new array that contains every nth element of a given array.
+
+```js
+const everynth = (arr, nth) => arr.filter((e, i) => i % nth === 0)
+/*
+ console.log(everynth([1,2,3,4,5,6], 2)) // -> [ 1, 3, 5 ]
+*/
+```