add show/add playlist button

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

@@ -25,7 +25,7 @@ public class Song {
 
     @Override
     public String toString() {
-        String result = getSongName() + " By " + getArtist();
+        String result = getSongName() + " by " + getArtist();
         return result;
     }
 }

src/main/resources/sbu/javafx/App-view.fxml

@@ -17,9 +17,11 @@
     <bottom>
         <HBox spacing="10" alignment="CENTER">
             <Button text="Previous" onAction="#handlePrevious"/>
-            <Button text="Play/Pause" onAction="#handlePlayAction"/>
+            <Button fx:id="playButton" text="Play" onAction="#handlePlayAction"/>
             <Button text="Next" onAction="#handlenext"/>
             <Button text="add to playlist" onAction="#addToPlaylist"/>
+            <Button text="show playList" onAction="#openPlaylistWindow"/>
+            <Button text="show all songs" onAction="#openAllSongs"/>
         </HBox>
     </bottom>
 </BorderPane>