Music and sound effects label added to sliders (#216)

* Add music and sound effects labels to options panel

Added labels for music and sound effects options in the UI.

* Refactor CreateOptionsPanel for consistency

Author: jordanlhunt

articles/tutorials/building_2d_games/20_implementing_ui_with_gum/snippets/titlescene/createoptionspanel.cs

@@ -1,5 +1,4 @@
-private void CreateOptionsPanel()
-{
+private void CreateOptionsPanel() {
     _optionsPanel = new Panel();
     _optionsPanel.Dock(Gum.Wireframe.Dock.Fill);
     _optionsPanel.IsVisible = false;
@@ -11,6 +10,12 @@ private void CreateOptionsPanel()
     optionsText.Text = "OPTIONS";
     _optionsPanel.AddChild(optionsText);
 
+    var musicLabel = new Label();
+    musicLabel.Text = "Music";
+    musicLabel.X = 35;
+    musicLabel.Y = 35;
+    optionsPanel.AddChild(musicLabel);
+
     var musicSlider = new Slider();
     musicSlider.Anchor(Gum.Wireframe.Anchor.Top);
     musicSlider.Y = 30f;
@@ -23,6 +28,12 @@ private void CreateOptionsPanel()
     musicSlider.ValueChangeCompleted += HandleMusicSliderValueChangeCompleted;
     _optionsPanel.AddChild(musicSlider);
 
+    var sfxLabel = new Label();
+    sfxLabel.Text = "SFX";
+    sfxLabel.X = 20;
+    sfxLabel.Y = 80;
+    optionsPanel.AddChild(sfxLabel);
+
     var sfxSlider = new Slider();
     sfxSlider.Anchor(Gum.Wireframe.Anchor.Top);
     sfxSlider.Y = 93;
@@ -42,4 +53,4 @@ private void CreateOptionsPanel()
     _optionsBackButton.Y = -10f;
     _optionsBackButton.Click += HandleOptionsButtonBack;
     _optionsPanel.AddChild(_optionsBackButton);
-}
+}