Updated citation file with manuscript

[fletchapin]

Pull request recommendations:

• Name your pull request your-development-type/short-description. Ex: feature/gui
• Link to any relevant issue in the PR description. Ex: Resolves [ENH: Create GUI for easy user input #12]
• Provide context of changes.
• Provide relevant tests for your feature or bug fix.
• Provide or update documentation for any feature added by your pull request.

Adding manuscript to CITATION.cff file

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.28%. Comparing base (a1872d3) to head (d602a57).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
- Coverage   87.31%   87.28%   -0.03%     
==========================================
  Files          11       11              
  Lines        3373     3373              
==========================================
- Hits         2945     2944       -1     
- Misses        428      429       +1     

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