If your organization does not already have a public .github repository, create a public .github repository. In your organization's .github repository, create a README.md file in the profile folder. Commit the changes to the README.md file. The content of the README.md will appear on your organization's profile. Source: https://docs.github.com/en/organizations/collaborating-with-groups-in-organizations/customizing-your-organizations-profile