Added Python solution for "Middle of the Linked List"

Author: Kyrylo-Ktl

Python/Middle of the Linked List.py

@@ -0,0 +1,23 @@
+from typing import Optional
+
+
+class ListNode:
+    def __init__(self, val=0, next=None):
+        self.val = val
+        self.next = next
+
+
+class Solution:
+    """
+    Time:   O(n)
+    Memory: O(1)
+    """
+
+    def middleNode(self, head: Optional[ListNode]) -> Optional[ListNode]:
+        slow = fast = head
+
+        while fast and fast.next:
+            slow = slow.next
+            fast = fast.next.next
+
+        return slow