Add xProd

snippets/xProd.md

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+### xProd
+
+Creates a new array out of the two supplied by creating each possible pair from the arrays.
+
+Use `Array.map()` to produce every possible pair from the elements of the two arrays.
+
+```js
+const xProd = (a, b) => a.map(x => b.map(y => [x, y]));
+```
+
+```js
+xProd([1, 2], ['a', 'b']); // [[1, 'a'], [1, 'b'], [2, 'a'], [2, 'b']]
+```