feat: Add two-pointer method to reverse an array in-place

🧠 Logic:
- Introduced `ReverseTheArray(int[] arr)` method using two pointers (`p1` at start, `p2` at end).
- Swap elements at `p1` and `p2` and move both pointers towards the center.
- This reverses the array efficiently in O(n) time and O(1) space.

Signed-off-by: Somesh diwan <[email protected]>

Author: Someshdiwan

Section9ArrayAB/Array 2.0/src/RotateTheArray.java

@@ -1,18 +1,15 @@
-/*
-public class RotateTheArrayTwopointer
-{
-    public static ReverseTheArray(int[] arr)
+public class RotateTheArrayTwoPointer {
+    public static void ReverseTheArray(int[] arr)
     {
         int p1 = 0;
         int p2 = arr.length - 1;
-
         while(p1 < p2)
         {
             int temp = arr[p1];
             arr[p1] = arr[p2];
             arr[p2] = temp;
-
+            p1++;
+            p2--;
         }
     }
 }
-*/