Add CITATION.cff

[carmocca]

What does this PR do?

Context:

https://github.blog/2021-08-19-enhanced-support-citations-github/
https://docs.github.com/en/github/creating-cloning-and-archiving-repositories/creating-a-repository-on-github/about-citation-files

Spec:
https://github.com/citation-file-format/citation-file-format/blob/main/schema-guide.md

See the result in:
https://github.com/PyTorchLightning/pytorch-lightning/tree/github/cff

to the right, below "About" there is now a button "cite this repository"

APA:

William, F., & The PyTorch Lightning team. (2019). PyTorch Lightning (Version 1.4.4) [Computer software]. https://doi.org/10.5281/zenodo.3828935`

BibTeX

@misc{William_PyTorch_Lightning_2019,
author = {William, Falcon and {The PyTorch Lightning team}},
doi = {10.5281/zenodo.3828935},
month = {3},
title = {{PyTorch Lightning}},
url = {https://github.com/PyTorchLightning/pytorch-lightning},
year = {2019}
}

Does your PR introduce any breaking changes? If yes, please list them.

None

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[Borda]

exactly he same @justusschock was speaking last week :]

[codecov]

Codecov Report

Merging #9139 (b2bdbea) into master (b13749b) will increase coverage by 0%.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #9139   +/-   ##
======================================
  Coverage      92%     92%           
======================================
  Files         176     176           
  Lines       14786   14810   +24     
======================================
+ Hits        13634   13663   +29     
+ Misses       1152    1147    -5     

[tchaton]

LGTM !

[Borda]

let's enable the zenodo first