docs: add Codecov badge to README

[GeiserX]

Add Codecov coverage badge to the README badge section.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 4e0f20ca-1b69-47ca-a3f6-a39a1966cc0e

📥 Commits

Reviewing files that changed from the base of the PR and between 0a5de75 and a5f0262.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/add-codecov-badge

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