docs(README): add info

Author: thomasleplus

README.md

@@ -9,3 +9,19 @@ Receive an email notification for each birthday in your 'Birthdays' calendar.
 ## [Export To Office](export-to-office/)
 
 Export all Google Docs, Google Spreasheets and Google Slides to Microsoft Word, Microsoft Excel and Microsoft Powerpoint format (respectively).
+
+## Contributing
+
+Please read [CONTRIBUTING.md](CONTRIBUTING.md) for details on our code of conduct and the process for submitting pull requests.
+
+## Security
+
+Please read [SECURITY.md](SECURITY.md) for details on our security policy and how to report security vulnerabilities.
+
+## Code of Conduct
+
+Please read [CODE_OF_CONDUCT.md](CODE_OF_CONDUCT.md) for details on our code of conduct.
+
+## License
+
+This project is licensed under the terms of the [LICENSE](LICENSE) file.