add a isDivisible function

snippets/divisible-by-number.md

@@ -0,0 +1,9 @@
+### Divisible by number
+
+Using the module operator `%` we can check if the reminder is equal
+to zero. In this case the function returns `true`. We can use this
+function for checking if a number is even or odd passing 2 as `divisor`
+
+```js
+var isDivisible = (dividend, divisor) => dividend % divisor === 0;
+```