Add link to rotary encoder branch

readme.md

@@ -7,6 +7,10 @@ This python script is supposed to run on a rpi and does the following :
  * Button input : watches GPIOs for button input ; I'm using 5 push buttons for controlling playback (previous, next, toggle playback, stop, menu) or browse the database and add stuff to the playlist.  
  * Potentiometer input : Watches a GPIO for estimating the resistance of a rotary potentiometer and set volume accordingly.  
  
+## Rotary encoder version
+
+A WIP version that replaces the potentiometer with a rotary encoder [is available here.](/arthus/mpdlistenpy/src/branch/rot_enc)
+ 
 ## Setup
 
 ### Software