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

.gitignore

@@ -0,0 +1,28 @@
+# Unity
+/[Ll]ibrary/
+/[Tt]emp/
+/[Oo]bj/
+/[Bb]uild/
+/[Bb]uilds/
+/[Ll]ogs/
+/[Uu]ser[Ss]ettings/
+/[Mm]emoryCaptures/
+/[Rr]ecordings/
+
+# IDE
+.vs/
+.idea/
+*.swp
+*.swo
+*~
+
+# Cursor (local)
+.cursor/
+
+# Node / Needle web builds
+**/node_modules/
+Needle/**/dist/
+
+# OS
+.DS_Store
+Thumbs.db