Add Bubble Sort algorithm with comments

Sorting/BubbleSort.java

@@ -0,0 +1,40 @@
+/**
+ * BubbleSort.java
+ * This program implements the Bubble Sort algorithm.
+ * Time Complexity: O(n^2)
+ */
+
+public class BubbleSort {
+
+    public static void bubbleSort(int[] arr) {
+        int n = arr.length;
+        boolean swapped;
+        for (int i = 0; i < n - 1; i++) {
+            swapped = false;
+
+            for (int j = 0; j < n - i - 1; j++) {
+                if (arr[j] > arr[j + 1]) {
+                    // swap arr[j] and arr[j+1]
+                    int temp = arr[j];
+                    arr[j] = arr[j + 1];
+                    arr[j + 1] = temp;
+
+                    swapped = true;
+                }
+            }
+
+            // If no two elements were swapped, array is sorted
+            if (!swapped)
+                break;
+        }
+    }
+
+    public static void main(String[] args) {
+        int[] arr = {64, 25, 12, 22, 11};
+        bubbleSort(arr);
+        System.out.println("Sorted array:");
+        for (int num : arr) {
+            System.out.print(num + " ");
+        }
+    }
+}