Open sourcing AI Data Readiness Tutorial

After the hackathon and implementing any follow up actions, I would like to make the repository open source. The Met Office has some procedures to go through for this, as described in the page:
* [General Science Information Asset page](https://metoffice.sharepoint.com/sites/ScienceInformationAssetsCommsSite)
* [FAQs](https://metoffice.sharepoint.com/sites/ScienceInformationAssetsCommsSite/SitePages/FAQ.aspx)

This issue is to document what we need to do and progress on those items.

List of tasks (should be done roughly in this order)

- [x] Add license file
- [x] Add crown copyright headers to files
- [x] Agreement for Science Section Owner (George Pankiewicz)
- [x] Add to Information Asset registry (see below)
- [x] Create developer/contributor guidelines and working practices document.
- [x] Email Information Asset Guardian about addition to registry (Glenn Greed)
- [x] Move repo to Met Office org
- [ ] Make repo open
- [ ] Publicise repo

Links
* [Information Asset registry ](https://metoffice.sharepoint.com/:x:/r/sites/ScienceInformationAssetsCommsSite/_layouts/15/Doc.aspx?sourcedoc=%7B6beec987-3bf2-432e-9bec-e06e1cea776f%7D&action=view)
* [Guide to Editing the Information Asset Registry]()