Add arduino code

Signed-off-by: 0x4248 <60709927+0x4248@users.noreply.github.com>

arduino/README.txt

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+ARDUINO FIRMWARE
+================
+
+Contained in this folder is sketches I have written for the ardunio platform.
+Most of the sketches are witten in "ino" ardunio sketch format.  I currently
+have an arduino uno R3.
+
+Most of the code provided here is under the GNU General Public License v3.0.

arduino/blink/blink.ino

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+/* SPDX-License-Identifier: GPL-3.0
+ * Arduino blink
+ *
+ * blink.ino
+ *
+ * This simple ardiuno program will blink the built-in LED on and off.
+ * 
+ * COPYRIGHT NOTICE
+ * Copyright (C) 2024 0x4248 and contributors
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the license is not changed.
+ *
+ * This software is free and open source. Licensed under the GNU general
+ * public license version 3.0 as published by the Free Software Foundation.
+ */
+
+void setup() {
+  pinMode(LED_BUILTIN, OUTPUT);
+}
+
+void loop() {
+  digitalWrite(LED_BUILTIN, HIGH);
+  delay(1000);
+  digitalWrite(LED_BUILTIN, LOW);
+  delay(1000);                       
+}