feature/codecov

[RyosukeDTomita]

• chore: update readme
• feat: add CodeCov
• chore: add score card

[codecov]

Welcome to Codecov 🎉

Once you merge this PR into your default branch, you're all set! Codecov will compare coverage reports and display results in all future pull requests.

ℹ️ You can also turn on project coverage checks and project coverage reporting on Pull Request comment

Thanks for integrating Codecov - We've got you covered ☂️

[Copilot]

Pull request overview

This PR adds code coverage reporting, security scorecard badges, and improves documentation. The changes introduce CodeCov integration for test coverage tracking and OpenSSF Scorecard for security metrics, while also enhancing the README with better context about the project.

• CodeCov integration with automated coverage reporting in the test workflow
• OpenSSF Scorecard and additional status badges in README
• Enhanced documentation explaining the project's purpose and advantages

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
README.md	Added CodeCov, OpenSSF Scorecard, and workflow badges; expanded ABOUT section with project rationale and usage examples
.github/workflows/deno_test.yml	Enhanced test workflow with coverage collection, LCOV report generation, and CodeCov upload; refined triggers to run only on relevant file changes

[Copilot]

Typo in API name: "EST API" should be "REST API" (Representational State Transfer).

Suggested change

	Create a GitHub contribution streak badge SVG using [GitHub EST API](https://docs.github.com/ja/rest?apiVersion=2022-11-28) and [Deno](https://deno.com/), and deploy it to [GitHub Pages](https://docs.github.com/ja/pages/getting-started-with-github-pages/creating-a-github-pages-site).
	Create a GitHub contribution streak badge SVG using [GitHub REST API](https://docs.github.com/ja/rest?apiVersion=2022-11-28) and [Deno](https://deno.com/), and deploy it to [GitHub Pages](https://docs.github.com/ja/pages/getting-started-with-github-pages/creating-a-github-pages-site).