feat: myrpackage with professional development infrastructure

[DiogoRibeiro7]

This comprehensive update transforms the basic package scaffold into a
production-ready R package following best practices:

• Add multilingual support to hello() and goodbye() functions
• Improve documentation with roxygen2 and vignettes
• Add CI/CD with GitHub Actions for testing, coverage, and pkgdown
• Add development tools: lintr, styler, covr, and testthat
• Create contribution guidelines and code of conduct
• Enhance package metadata and CITATION
• Add comprehensive tests for all functions
• Set up pkgdown for auto-generated documentation site

[Copilot]

Pull Request Overview

This PR transforms a basic R package scaffold into a production-ready package with comprehensive development infrastructure and enhanced functionality. The core functions hello() and goodbye() have been upgraded with multilingual support and improved documentation.

Key changes include:

• Enhanced functions with multilingual support (English, Spanish, French, Portuguese) and input validation
• Comprehensive CI/CD setup with GitHub Actions for testing, coverage, linting, and documentation
• Development infrastructure including package website generation, contribution guidelines, and code quality tools

Reviewed Changes

Copilot reviewed 24 out of 24 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
R/hello.R	Enhanced with multilingual support, input validation, and comprehensive documentation
R/goodbye.R	Enhanced with multilingual support, input validation, and comprehensive documentation
tests/testthat/test-hello.R	Comprehensive test suite covering all function parameters and validation
tests/testthat/test-goodbye.R	Comprehensive test suite covering all function parameters and validation
vignettes/intro.Rmd	Complete user guide with examples and usage instructions
.github/workflows/*.yaml	CI/CD workflows for testing, coverage, linting, and documentation
_pkgdown.yml	Configuration for automated package website generation
DESCRIPTION	Updated with dependencies, URLs, and proper package metadata
README.md	Professional package documentation with usage examples and development instructions

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.
You can also share your feedback on Copilot code review for a chance to win a $100 gift card. Take the survey.}