fix: 📝 Update citation information and add DOI badge

[Anselmoo]

The README.md file was updated to include a badge displaying the DOI for the software article.

All PR-Submissions:

---

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open
  Pull Requests for the same
  update/change?

New ✨✨ Feature-Submissions:

---

• Does your submission pass tests?
• Have you lint your code locally prior to submission? Fixed:
• This PR is for a new feature, not a bug fix.

Changes to ⚙️ Core-Features:

---

• Have you added an explanation of what your changes do and why you'd like
  us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully run tests with your changes locally?

[sourcery-ai]

We've reviewed this pull request using the Sourcery rules engine. If you would also like our AI-powered code review then let us know.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (2095acc) to head (7591f7e).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1326   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           44        44           
  Lines         4467      4467           
=========================================
  Hits          4467      4467           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.