feat: add valid anagram solution

Author: mangodm-web

valid-anagram/mangodm-web.py

@@ -0,0 +1,9 @@
+from collections import Counter
+
+
+class Solution:
+    def isAnagram(self, s: str, t: str) -> bool:
+        if len(s) != len(t):
+            return False
+
+        return Counter(s) == Counter(t)