Add initial Unity project files and settings

Add a full Unity project scaffold: Input System actions (.inputactions + meta), SampleScene and scene meta, URP render pipeline and profile assets, TutorialInfo (scripts/icons), a Readme LFS pointer, ProjectSettings (audio, graphics, input, quality, XR, etc.), and Packages/manifest.json. Sets up default player and UI input mappings, rendering settings, and editor/project configuration for the project.

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;
+    }
+}