Create BubbleSortAlgo-JS

I have added a simple Bubble Sort implementation in JavaScript.
The code is clean, easy to understand, and follows the style of the repository.
Please review and merge this PR.

Author: koushitha-30734

BubbleSortAlgo-JS

@@ -0,0 +1,14 @@
+function bubbleSort(arr) {
+  let n = arr.length;
+  for (let i = 0; i < n - 1; i++) {
+    for (let j = 0; j < n - i - 1; j++) {
+      if (arr[j] > arr[j + 1]) {
+        // swap
+        [arr[j], arr[j + 1]] = [arr[j + 1], arr[j]];
+      }
+    }
+  }
+  return arr;
+}
+
+console.log(bubbleSort([5, 3, 8, 1, 2])); // Output: [1, 2, 3, 5, 8]