[bsp] revert delete of stm32f407-sparkfire RTduino pinout

bsp/stm32/stm32f407-rt-spark/applications/arduino_main.cpp

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author         Notes
+ * 2024-04-08     Li ZhenHong    first version
+ */
+
+#include <Arduino.h>
+
+void setup(void)
+{
+    /* put your setup code here, to run once: */
+    Serial.begin();
+}
+
+void loop(void)
+{
+    /* put your main code here, to run repeatedly: */
+    Serial.println("Hello Arduino!");
+    delay(800);
+}