add audio volume to init. configFile coderbot

Author: MicheleCarbonera

coderbot.cfg

@@ -35,5 +35,6 @@
    "ctrl_hud_image":"",
    "load_at_start":"",
    "sound_start":"$startup.mp3",
-   "encoder":"True"
+   "encoder":"True",
+   "audio_volume_level":"100"
 }