add task 2

2. Add Two Numbers/solution.py

@@ -0,0 +1,26 @@
+# Definition for singly-linked list.
+# class ListNode:
+#     def __init__(self, val=0, next=None):
+#         self.val = val
+#         self.next = next
+class Solution:
+    def addTwoNumbers(self, l1: Optional[ListNode], l2: Optional[ListNode]) -> Optional[ListNode]:
+        dummy = ListNode()
+        cur = dummy 
+
+        carry = 0
+        while l1 or l2 or carry:
+            v1 = l1.val if l1 else 0
+            v2 = l2.val if l2 else 0
+
+            val = v1 + v2 + carry 
+
+            carry = val // 10
+            val = val % 10 
+            cur.next = ListNode(val)
+
+            cur = cur.next
+            l1 = l1.next if l1 else None
+            l2 = l2.next if l2 else None
+
+        return dummy.next