Added Monotonic Array Leetcode Problem with solution

LeetCode/Monotonic Array/PROBLEM.md

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+## 896. Monotonic Array 
+An array is monotonic if it is either monotone increasing or monotone decreasing.
+
+An array nums is monotone increasing if for all i <= j, nums[i] <= nums[j]. An array nums is monotone decreasing if for all i <= j, nums[i] >= nums[j].
+
+Given an integer array nums, return true if the given array is monotonic, or false otherwise.
+
+
+
+### Example 1:
+
+Input: nums = [1,2,2,3]
+Output: true
+
+### Example 2:
+
+Input: nums = [6,5,4,4]
+Output: true
+
+### Example 3:
+
+Input: nums = [1,3,2]
+Output: false
+
+
+### Constraints:
+
+1 <= nums.length <= 10^5
+-10^5 <= nums[i] <= 10^5

LeetCode/Monotonic Array/Python/main.py

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+class Solution:
+    def isMonotonic(self, nums: list[int]) -> bool:
+        is_increasing = True  # Indicates if the array is increasing.
+        is_decreasing = True  # Indicates if the array is decreasing.
+
+        # Check if the array is either increasing or non-increasing.
+        for i in range(1, len(nums)):
+            # Check increasing condition.
+            if nums[i] < nums[i - 1]:
+                is_increasing = False
+
+            # Check decreasing condition.
+            elif nums[i] > nums[i - 1]:
+                is_decreasing = False
+
+            # If it is neither increasing nor decreasing then don't continue the loop.
+            if not is_increasing and not is_decreasing:
+                break
+
+        return is_increasing or is_decreasing  # Return true if either condition is met