add fiber app

go-fiber-simple/main.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+	"os"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+func getPort() string {
+	port := os.Getenv("PORT")
+	if port == "" {
+		port = ":3000"
+	} else {
+		port = ":" + port
+	}
+
+	return port
+}
+
+func main() {
+	app := fiber.New()
+
+	app.Get("/", func(c *fiber.Ctx) error {
+		return c.JSON(fiber.Map{
+			"message": "Hello, Railway!",
+		})
+	})
+
+	app.Listen(getPort())
+}