add instructions for R programming language

[Mike-Hanna]

Pull Request Checklist

• I have read and followed the CONTRIBUTING.md guidelines.
• My contribution adds a new instruction, prompt, or chat mode file in the correct directory.
• The file follows the required naming convention.
• The content is clearly structured and follows the example format.
• I have tested my instructions, prompt, or chat mode with GitHub Copilot.
• I have run node update-readme.js and verified that README.md is up to date.

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Description

This pull request adds comprehensive instructions for R programming language projects to guide GitHub Copilot in generating idiomatic, safe, and maintainable R code. The main change is the introduction of a new instruction file for R, which is also linked in the main instructions README for discoverability.

R language support and documentation:

• Added a new instructions/r.instructions.md file providing detailed conventions, best practices, and Copilot-specific guidance for R, Rmd, and Quarto files. The instructions cover style, safety, reproducibility, performance, error handling, security, and minimal code examples.
• Updated README.instructions.md to include a link to the new R instructions, making them accessible alongside other language and framework guides.

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Type of Contribution

• New instruction file.

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Additional Notes

None.

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By submitting this pull request, I confirm that my contribution abides by the Code of Conduct and will be licensed under the MIT License.

[Copilot]

Pull Request Overview

This pull request adds comprehensive coding instructions for R programming language projects to guide GitHub Copilot in generating idiomatic and maintainable R code. The instructions cover R, R Markdown, and Quarto files with detailed guidance on style, performance, security, and best practices for both base R and tidyverse approaches.

Key changes:

• Added detailed R programming instructions covering conventions, performance, security, and Copilot-specific guidance
• Included practical code examples demonstrating both base R and tidyverse patterns
• Updated the instructions README to link the new R instructions

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
instructions/r.instructions.md	New instruction file with comprehensive R coding standards, best practices, and minimal code examples
README.instructions.md	Added table entry linking to the new R instructions file

[Copilot]

Pull Request Overview

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

[Copilot]

Pull Request Overview

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