Update README.md

Author: joetannenbaum

README.md

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 Visit [inertiajs.com](https://inertiajs.com/) to learn more.
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+## Contributing
+
+Thank you for considering contributing to Inertia! You can read the contribution guide [here](.github/CONTRIBUTING.md).
+
+## Code of Conduct
+
+In order to ensure that the Laravel community is welcoming to all, please review and abide by the [Code of Conduct](https://laravel.com/docs/contributions#code-of-conduct).
+
+## Security Vulnerabilities
+
+Please review [our security policy](https://github.com/inertiajs/inertia-laravel/security/policy) on how to report security vulnerabilities.
+
+## License
+
+Inertia is open-sourced software licensed under the [MIT license](LICENSE.md).