add links to vvvv and openFrameworks client libraries

Author: soundanalogous

readme.md

@@ -63,6 +63,10 @@ Most of the time you will be interacting with Arduino with a client library on t
   * [https://www.wolfram.com/system-modeler/libraries/model-plug/]
 * golang
   * [https://github.com/kraman/go-firmata]
+* vvvv
+  * [https://vvvv.org/blog/arduino-second-service]
+* openFrameworks
+  * [http://openframeworks.cc/documentation/communication/ofArduino/]
 
 Note: The above libraries may support various versions of the Firmata protocol and therefore may not support all features of the latest Firmata spec nor all Arduino and Arduino-compatible boards. Refer to the respective projects for details.