added yarn spinner package

NightclubArcadia/Packages/dev.yarnspinner.unity/Runtime/Attributes/LanguageAttribute.cs

@@ -0,0 +1,13 @@
+/*
+Yarn Spinner is licensed to you under the terms found in the file LICENSE.md.
+*/
+
+using UnityEngine;
+
+namespace Yarn.Unity.Attributes
+{
+    public class LanguageAttribute : PropertyAttribute
+    {
+        // No data or methods on this attribute; it's purely a marker.
+    }
+}