Link to docs from readme

README.md

@@ -9,12 +9,16 @@ Each car is able to:
  * detect other vehicles around it
  * communicate with them in order to compute the precedence according to road rules, or to signal an emergency situation
 
-The system has been realized by relying only on these three basic components:
+The system has been realized by relying only on these four basic components:
 
+ * Arduino UNO
  * IR emitters
  * IR receivers
  * Radio card
 
 The following is a video showing the results of the project:
 
-[![Watch the video](resources/video-preview.jpg)](https://youtu.be/jqtYrXdcc9c)
+[![Watch the video](resources/video-preview.jpg)](https://youtu.be/jqtYrXdcc9c)
+
+You can find the protocol specification in [docs/RFC-CCS.md](docs/RFC-CCS.md), or you can
+read the source code at [hwcontroller/](hwcontroller/).