Added queue total time in playing screen

app/src/main/java/com/kabouzeid/gramophone/service/MusicService.java

@@ -946,6 +946,13 @@ public class MusicService extends Service implements SharedPreferences.OnSharedP
         return playback.duration();
     }
 
+    public int getQueueDurationMillis(int position) {
+        int ret=0;
+        for(int i=position+1;i<playingQueue.size();i++)
+            ret+=playingQueue.get(i).duration;
+        return ret;
+    }
+
     public int seek(int millis) {
         synchronized (this) {
             try {