Added python solution for 284. Palindrome Linked List and Renamed the file. (#133)

* Added Python solution for 284. Palindrome Linked List

* Changed file name for 284.Palindrome Linked List

Author: JoyKrishan

Algorithms/Easy/284_PalindromeLinkedList/Solution.py

@@ -0,0 +1,30 @@
+class Solution:
+    def isPalindrome(self, head: Optional[ListNode]) -> bool:
+        fast, slow = head, head
+
+        while fast != None and fast.next != None:
+            fast = fast.next.next
+            slow = slow.next
+
+        slow = self.reverse(slow)
+        fast = head
+
+        while slow != None:
+            if fast.val != slow.val:
+                return False 
+            
+            fast = fast.next
+            slow = slow.next
+        
+        return True
+
+    def reverse(self, head):
+        prev = None
+
+        while head != None:
+            next = head.next
+            head.next = prev
+            prev = head
+            head = next  
+        
+        return prev