Add reorganize-string.py & Updated README.md (codedecks-in#154)

Author: Gamez0

Python/reorganize-string.py

@@ -0,0 +1,26 @@
+'''
+speed: 89.11%
+memory: 21:02%
+N = len(S), A = 1~26(size of diff alpabet)
+ex) aab, N=3, A=2
+time complexity: O(A * (N + logA))
+space complexity: O(N)
+'''
+class Solution:
+    def reorganizeString(self, S: str) -> str:
+        n = len(S)
+        a= []
+        
+        for c,x in sorted((S.count(x), x) for x in set(S)):
+            if c > (n+1)/2: # not possible
+                return ''
+            a.extend(c*x)
+        
+        # empty list
+        ans = [None] * n
+        
+        # placing letters to make possible result
+        ans[::2], ans[1::2] = a[n//2:], a[:n//2]
+        return "".join(ans)
+        
+        

README.md

@@ -160,6 +160,7 @@ Check out ---> [Sample PR](https://github.com/codedecks-in/LeetCode-Solutions/pu
 | 1374 | [Generate a String With Characters That Have Odd Counts](https://leetcode.com/problems/generate-a-string-with-characters-that-have-odd-counts/) | [Java](./Java/generate-a-string-with-characters-that-have-odd-counts.java) | _O(n)_ | _O(1)_ | Easy       |     |                 |
 | 859 | [Buddy Strings](https://leetcode.com/problems/buddy-strings/) | [Java](./Java/buddy-strings.java) | _O(n)_ | _O(1)_ | Easy       |     |                 |
 | 9   | [Palindrome Number](https://leetcode.com/problems/palindrome-number/) | [Java](./Java/palindrome-number.java) | _O(n)_ | _O(1)_ | Easy       |     |                 |
+| 767 | [Reorganize String](https://leetcode.com/problems/reorganize-string/)                                         | [Python](./Python/reorganize-string.py)                   | _O(n)_ | _O(n)_ | Medium       |     |                 |
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