Added download UI in home screen

app/src/main/java/com/cappielloantonio/play/model/Song.java

@@ -48,6 +48,9 @@ public class Song implements Parcelable {
     @Ignore
     public static final String IS_FAVORITE = "IS_FAVORITE";
 
+    @Ignore
+    public static final String DOWNLOADED = "DOWNLOADED";
+
     @Ignore
     public static final String RADIO = "RADIO";