Added isDivisble.js (#437)

* Added isDivisble.js

* isDivisible.js is now on StandardJS style

* isDivisible now have examples

Maths/isDivisible.js

@@ -0,0 +1,15 @@
+// Checks if a number is divisible by another number.
+
+const isDivisible = (num1, num2) => {
+  if (isNaN(num1) || isNaN(num2) || num1 == null || num2 == null) {
+    return 'All parameters have to be numbers'
+  }
+  if (num2 === 0) {
+    return 'Not possible to divide by zero'
+  }
+  return num1 % num2 === 0
+}
+
+console.log(isDivisible(10, 5)) // returns true
+console.log(isDivisible(123498175, 5)) // returns true
+console.log(isDivisible(99, 5)) // returns false