add badges to readme

[rrsettgast]

This PR adds status badges to readme

• zenodo badge
• continuous integration status
• codecov

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (56085b6) to head (f1c3caa).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main        #8   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           22        22           
  Lines          748       748           
=========================================
  Hits           748       748           

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[Copilot]

Pull Request Overview

This PR enhances the project README by adding status badges for citation, build status, and test coverage.

• Adds a Zenodo DOI badge
• Includes a GitHub Actions CI status badge
• Adds a Codecov coverage badge