Added Palindrome solution in python.

0009/README.md

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+#9 Palindrome Number
+
+Given an integer x, return true if x is palindrome integer.
+An integer is a palindrome when it reads the same backward as forward. 
+
+For example, 121 is palindrome while 123 is not.
+
+Example 1:
+
+Input: x = 121
+Output: true
+
+Example 2:
+
+Input: x = -121
+Output: false
+
+Explanation: From left to right, it reads -121. From right to left, it becomes 121-. Therefore it is not a palindrome.
+
+Example 3:
+
+Input: x = 10
+Output: false
+
+Explanation: Reads 01 from right to left. Therefore it is not a palindrome.
+
+Example 4:
+
+Input: x = -101
+Output: false
+
+
+Constraints:
+
+-2^31 <= x <= 2^31 - 1

0009/solution.py

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+class Solution:
+     def isPalindrome(self, x):
+        if str(x) == str(x)[::-1]:  return True
+        return False