Create InsertionSort

I added a simple and clean implementation of the Insertion Sort algorithm in JavaScript.
Please review and merge. Thank you!

Author: koushithatadiboina

InsertionSort

@@ -0,0 +1,14 @@
+function insertionSort(arr) {
+    for (let i = 1; i < arr.length; i++) {
+        let key = arr[i];
+        let j = i - 1;
+
+        while (j >= 0 && arr[j] > key) {
+            arr[j + 1] = arr[j];
+            j = j - 1;
+        }
+        arr[j + 1] = key;
+    }
+    return arr;
+}
+console.log(insertionSort([5, 2, 9, 1, 3]));