feat: implement push_head for linked list

Author: AhmadHmedann

Sprint-2/implement_linked_list/linked_list.py

@@ -0,0 +1,25 @@
+class LinkedList:
+    class clsNode:
+        def __init__(self, value):
+            self.next = None
+            self.previous = None
+            self.value = value
+
+    def __init__(self):
+        self.head = None
+        self.tail = None
+        self.size = 0
+
+    def push_head(self, value):
+        new_node = self.clsNode(value=value)
+        if self.head == None:
+            self.head = new_node
+            self.tail = new_node
+        else:
+            new_node.next = self.head
+            self.head.previous = new_node
+            self.head = new_node
+        self.size += 1
+        return new_node
+
+