Initial commit: Unity Needle AR Menu project with MenuScene and SampleScene web apps

Add root .gitignore for Unity Library/Temp/Logs, IDE folders, and node_modules.
Include Assets, Needle TypeScript (MenuController, asset picker, WebXR), and project configuration.

Made-with: Cursor

Assets/TutorialInfo/Scripts/Readme.cs

@@ -0,0 +1,16 @@
+using System;
+using UnityEngine;
+
+public class Readme : ScriptableObject
+{
+    public Texture2D icon;
+    public string title;
+    public Section[] sections;
+    public bool loadedLayout;
+
+    [Serializable]
+    public class Section
+    {
+        public string heading, text, linkText, url;
+    }
+}