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

skills-lock.json

@@ -0,0 +1,10 @@
+{
+  "version": 1,
+  "skills": {
+    "needle-engine": {
+      "source": "needle-tools/ai",
+      "sourceType": "github",
+      "computedHash": "60d581b23494afa9b1835c0f57e6d23fd6ba722a3c5c2138304de8243c0bfbd0"
+    }
+  }
+}