Add Soulution.go for 0009.Palindrome Number

Author: taoyq1988

solution/0009.Palindrome Number/Solution.go

@@ -0,0 +1,12 @@
+func isPalindrome(x int) bool {
+	if x < 0 {
+		return false
+	}
+	result := 0
+	y := x
+	for y != 0 {
+		result = result * 10 + y%10
+		y /= 10
+	}
+	return result == x
+}