Add duecredit to keep track of citations

[smoia]

Closes #

Proposed Changes

Change Type

• bugfix (+0.0.1)
• minor (+0.1.0)
• major (+1.0.0)
• refactoring (no version update)
• test (no version update)
• infrastructure (no version update)
• documentation (no version update)
• other

Checklist before review

• I added everything I wanted to add to this PR.
• [Code or tests only] I wrote/updated the necessary docstrings.
• [Code or tests only] I ran and passed tests locally.
• [Documentation only] I built the docs locally.
• My contribution is harmonious with the rest of the code: I'm not introducing repetitions.
• My code respects the adopted style, especially linting conventions.
• The title of this PR is explanatory on its own, enough to be understood as part of a changelog.
• I added or indicated the right labels.

• I added information regarding the timeline of completion for this PR.

• Please, comment on my PR while it's a draft and give me feedback on the development!

[codecov]

Codecov Report

Merging #27 (e6ca7d1) into master (24d85e8) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   90.41%   90.50%   +0.09%     
==========================================
  Files          13       14       +1     
  Lines        1043     1053      +10     
==========================================
+ Hits          943      953      +10     
  Misses        100      100              

Impacted Files	Coverage Δ
nigsp/operations/metrics.py	100.00% <100.00%> (ø)
nigsp/references.py	100.00% <100.00%> (ø)
nigsp/workflow.py	73.73% <100.00%> (+0.36%)	⬆️