feat: add 0217 Contains Duplicate solution

Author: hyogshin

contains-duplicate/hyogshin.py

@@ -0,0 +1,7 @@
+class Solution:
+    def containsDuplicate(self, nums: List[int]) -> bool:
+        if len(nums) == len(set(nums)):
+            return False
+        else:
+            return True
+