Update README build badge

[ABC4RDacademy]

This updates the README build badge from the legacy Travis CI badge to the existing GitHub Actions Maven build workflow badge.\n\nNo code changes.

Summary by CodeRabbit

• Documentation
  • Updated build status badges in the README with current CI infrastructure and added coverage and code quality status indicators.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: d3f4e8cb-5070-4589-b638-f321ca3a0a42

📥 Commits

Reviewing files that changed from the base of the PR and between 82c274c and c6dced8.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README.md Build Status badge section was updated to replace a Travis CI badge with a GitHub Actions-based badge, and additional badges for Coverage and Codacy were added.

Changes

Documentation & Metadata Update

Layer / File(s)	Summary
Badge Configuration README.md	Travis CI build badge replaced with GitHub Actions badge; Coverage and Codacy badges added to provide real-time project health visibility.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title 'Update README build badge' accurately and clearly describes the main change: updating the build status badge in the README from Travis CI to GitHub Actions.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud