Adding README to wmo-im GitHub profile

[isedwards]

Could you also add the contents of the README file to the main github.com/wmo-im profile page to make it easier to find information?

It requires creating a new repository called .github and placing the readme in /profile/README.md.

See instructions: https://docs.github.com/en/organizations/collaborating-with-groups-in-organizations/customizing-your-organizations-profile#adding-a-public-organization-profile-readme

The README is then shown above the pinned repos on the profile page, e.g.