Add Codecov coverage badge to README

[GeiserX]

Add Codecov coverage badge alongside existing badges in the README.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: f694130f-c0bf-4c01-978e-6ea75cabf42f

📥 Commits

Reviewing files that changed from the base of the PR and between dee72b4 and 43bd061.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/add-coverage-badge

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