docs: Add coverage badge to README

[yanurag-dev]

Summary by CodeRabbit

• Documentation
  • Added a coverage status badge to the README for visibility into project quality metrics.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 62338a6a-5eb6-4f95-a731-32e748a7d4ba

📥 Commits

Reviewing files that changed from the base of the PR and between 0e4285a and 580985c.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README's centered badge section now includes a line-break after "Built with Go · MIT License" and adds a new Coverage status badge linked to an external coverage service.

Changes

Cohort / File(s)	Summary
Documentation Updates README.md	Added line-break after "Built with Go · MIT License" and introduced a new Coverage status badge with external link.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A badge so shiny, bright and new,
Coverage metrics on display for you,
With line-breaks clean and spacing just right,
The README gleams in digital light! ✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch worktree-testing

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