Add solution array map prototype

problem/implement-array-prototype-map_en.md

@@ -1,4 +1,16 @@
+The function in this code takes two parameters - the callback function and `this` argument. We assign `this` to a new variable called array.
+We use forEach to loop over the calling array because forEach will skip the empty elements. We call the callback function using the `.call` method
+so that we can pass the this argument. We assign the output of the function to the index in the output so that the output has the corresponding
+empty elements too. For example, if `this` has empty elements at index 2 and 4, the output too will have empty elements at the same indices.
 
-There is no solution yet.
+```javascript
+  Array.prototype.myMap = function(callbackFn, thisArg) {
+  const array = this;
+  const output = [];
 
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+  this.forEach((element, index) => {
+    output[index] = callbackFn.call(thisArg, element, index, array);
+  });
+  return output;
+}
+```