add Song class

src/main/java/sbu/javafx/Song.java

@@ -14,6 +14,7 @@ public class Song {
     public String getSongName() {
         return songName;
     }
+
     public String getArtist() {
         return artist;
     }
@@ -21,4 +22,10 @@ public class Song {
     public String getSongAddress() {
         return songAddress;
     }
+
+    @Override
+    public String toString() {
+        String result = getSongName() + " By " + getArtist();
+        return result;
+    }
 }