Add CITATION.cff to pipeline template

[ErikDanielsson]

As was suggested in #361.

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

[codecov]

Codecov Report

Merging #1668 (dee6aa3) into dev (8327c57) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #1668   +/-   ##
=======================================
  Coverage   68.07%   68.07%           
=======================================
  Files          56       56           
  Lines        6588     6588           
=======================================
  Hits         4485     4485           
  Misses       2103     2103           

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