chore: Add CI/CD pipeline with test coverage and contributing guidelines

[nik-kale]

Summary

This PR establishes a comprehensive CI/CD pipeline using GitHub Actions, enabling automated testing, code quality checks, and streamlined releases. It also adds contributing guidelines to help new contributors get started.

Changes

• Created GitHub Actions CI workflow with multi-Python version testing (3.10, 3.11, 3.12)
• Added automated linting (ruff), formatting (black), and type checking (mypy)
• Configured pytest with coverage reporting and Codecov integration
• Created release automation workflow for tagged releases
• Added PR template for consistent pull request submissions
• Created CONTRIBUTING.md with development setup and workflow guidelines
• Updated project configuration for code quality tools

Type of Change

• Chore (maintenance, tooling, CI/CD)
• Documentation update

Testing

CI workflow has been configured to:

• Run tests on Python 3.10, 3.11, and 3.12
• Check code formatting with black
• Lint code with ruff
• Type check with mypy
• Measure and report test coverage

Checklist

• Code follows project style guidelines
• Self-review completed
• Documentation updated
• No new warnings introduced

Related Issues

Implements Feature #7 from feature roadmap

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