add some exaples, rotation this is for go course,

twonums this is a problem from leetcode

twonums/twonums.go

@@ -0,0 +1,23 @@
+package twonums
+
+import "fmt"
+
+func main() {
+	var test_nums []int
+	test_nums = append(test_nums, 2, 3, 5, 6, 9, 1)
+	fmt.Print(twoSum(test_nums, 10))
+}
+
+func twoSum(nums []int, target int) []int {
+
+	var result []int
+
+	for i := 0; i < len(nums); i++ {
+		for j := i + 1; j < len(nums); j++ {
+			if nums[i]+nums[j] == target {
+				result = append(result, i, j)
+			}
+		}
+	}
+	return result
+}