add button location property

MiraAPI.Example/Buttons/ExampleButton.cs

@@ -12,8 +12,9 @@ public class ExampleButton : CustomActionButton
     public override float Cooldown => 5f;
     public override float EffectDuration => 0f;
     public override int MaxUses => 5;
-    public override LoadableAsset<Sprite> Sprite { get; } = ExampleAssets.ExampleButton;
-    
+    public override LoadableAsset<Sprite> Sprite => ExampleAssets.ExampleButton;
+    public override ButtonLocation Location => ButtonLocation.BottomRight;
+
     protected override void OnClick()
     {
         Logger<ExamplePlugin>.Info("Example button clicked!");