Initial commit: Star of Words Unity project

Snapshot of the existing Unity 6 language-learning word game before any
refactoring. Adds Unity .gitignore and .gitattributes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/Scripts/3.5/SoundManager.cs

@@ -0,0 +1,19 @@
+using UnityEngine;
+
+public class SoundManager : MonoBehaviour
+{
+    public static SoundManager instance;
+    public AudioSource audioSource;
+    public AudioClip clickSound;
+
+    void Awake()
+    {
+        instance = this;
+    }
+
+    public void PlayClick()
+    {
+        if (audioSource && clickSound)
+            audioSource.PlayOneShot(clickSound);
+    }
+}