Create CITATION.bib

[tmigot]

Add bib file with the citation.

Link to Zenodo notice: https://zenodo.org/record/3672094

[codecov]

Codecov Report

Merging #51 (df111c9) into master (887e79a) will not change coverage.
The diff coverage is n/a.

❗ Current head df111c9 differs from pull request most recent head 9703f2b. Consider uploading reports for the commit 9703f2b to get more accurate results

@@           Coverage Diff           @@
##           master      #51   +/-   ##
=======================================
  Coverage   99.95%   99.95%           
=======================================
  Files         212      212           
  Lines        2012     2012           
=======================================
  Hits         2011     2011           
  Misses          1        1           

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[dpo]

Could you also add the usual notice in the README?l

[dpo]

Thanks