Update solution 344 [Python3]

Author: chakyam

solution/344.Reverse String/Solution.py

@@ -0,0 +1,15 @@
+class Solution:
+    def reverseString(self, s):
+        """
+        :type s: str
+        :rtype: str
+        """
+        length=len(s)
+        if length < 2:
+            return s
+        ns=''
+        p=length-1
+        while p >= 0:
+            ns += s[p]
+            p-=1
+        return ns