docs(changeset): Enhance context menu documentation with submenu support details

Author: theoribbi

packages/primitives/README.md

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+![hero](https://github.com/nativeui-org/primitives/raw/main/assets/hero.svg)
+
+# NativeUI Primitives
+
+A collection of unstyled, accessible UI primitives for React Native. Built with flexibility in mind, these components work seamlessly across iOS, Android, and Web.
+
+Start here, then make it your own. Open Source. Open Code. Use this to build your own component library.
+
+## Documentation
+
+Visit [primitives.nativeui.io](https://primitives.nativeui.io) to view the documentation.
+
+## Contributing
+
+Please read the [contributing guide](./CONTRIBUTING.md).
+
+## License
+
+Licensed under the [MIT license](./LICENSE).