Added tests and implemented solution for the refactor section - includes.js

Author: Konvaly

Sprint-1/refactor/includes.js

@@ -1,9 +1,8 @@
 // Refactor the implementation of includes to use a for...of loop
 
 function includes(list, target) {
-  for (let index = 0; index < list.length; index++) {
-    const element = list[index];
-    if (element === target) {
+  for (const el of list) {
+    if (el === target) {
       return true;
     }
   }