LEETCODE 2022 Added solution for middle-of-the-linked-list

src/leetcode/linked-list.md

@@ -1 +1,18 @@
-# Linked List
+# Linked List
++ [Middle of the Linked List](#middle-of-the-linked-list)
+## Middle of the Linked List
+https://leetcode.com/problems/middle-of-the-linked-list/
+```java
+class Solution {
+    public ListNode middleNode(ListNode head) {
+        ListNode slow = head;
+        ListNode fast = head;
+        while (fast != null && fast.next != null) {
+            slow = slow.next;
+            fast = fast.next.next;
+        }
+        return slow;
+    }
+}
+
+```