feat: adds palindrome_number exercise

Author: flamiedev

palindrome_number.py

@@ -0,0 +1,13 @@
+class Solution:
+    def isPalindrome(self, x: int) -> bool:
+        if x < 0:
+            return False
+
+        num = x
+        reversed_num = 0
+
+        for i in range(len(x)):
+            reversed_num = reversed_num * 10 + x % 10
+            x = x // 10
+
+        return num == reversed_num