Add Node-RED to list of client libraries

Author: soundanalogous

readme.md

@@ -49,6 +49,7 @@ Most of the time you will be interacting with Arduino with a client library on t
   * [https://github.com/firmata/firmata.js](https://github.com/firmata/firmata.js)
   * [https://github.com/rwldrn/johnny-five](https://github.com/rwldrn/johnny-five)
   * [http://breakoutjs.com](http://breakoutjs.com)
+  * [https://nodered.org/docs/faq/interacting-with-arduino#firmata](Node-RED)
 * java
   * [https://github.com/kurbatov/firmata4j](https://github.com/kurbatov/firmata4j)
   * [https://github.com/4ntoine/Firmata](https://github.com/4ntoine/Firmata)