Add citation info for ICHEP2022 paper

[graeme-a-stewart]

BEGINRELEASENOTES
Add citation information to README.md and corresponding CITATION.cff file
ENDRELEASENOTES

Closes #407

[m-fila]

I'd suggest to go with credit redirection pattern for the citation file:

• create main citation as for software repository (possibly with help from zenodo export)
• under field preferred-citation put citation for an article. The "GitHub -> About -> Cite" will point to the article, but more advanced scrappers may use also the extra information about software

[tmadlener]

Can we also fit the zenodo information into the CITATIONS.cff somehow, or should we simply also merge #375 to get the batch onto the README?

[graeme-a-stewart]

Thanks @m-fila - that's a good suggestion about the preferred-citation. I updated that. I also added the Zenodo DOI badge, originally from #375.

With respect of credit to the code authors, I checked https://github.com/key4hep/EDM4hep/graphs/contributors and decided to cut on >=1000 lines contributed. To be discussed...

Tangentially, https://allcontributors.org is a great way of acknowledging the contributions of the whole community to the project (see, e.g., https://github.com/JuliaHEP/JetReconstruction.jl?tab=readme-ov-file#contributors-)