feat : add go solution

202508/2264 largestGoodInteger/GO/main.go

@@ -0,0 +1,23 @@
+package main
+
+import "fmt"
+
+func LargestGoodInteger(num string) string {
+	max := ""
+
+	for i := 0; i < len(num)-2; i++ {
+		if num[i] == num[i+1] && num[i] == num[i+2] {
+			current := string([]byte{num[i], num[i], num[i]})
+
+			if current > max {
+				max = current
+			}
+		}
+	}
+
+	return max
+}
+
+func main() {
+	fmt.Println(LargestGoodInteger("7636669283"))
+}