add mpd client accessory

config-sample.json

@@ -183,6 +183,13 @@
             "description": "Control the Hyperion TV backlight server. https://github.com/tvdzwan/hyperion",
             "host": "localhost", 
             "port": "19444"
+        },
+        {
+            "accessory": "mpdclient",
+            "name" : "mpd",
+            "host" : "localhost",
+            "port" : 6600,
+            "description": "Allows some control of an MPD server"
         }
     ]
 }