add write-coding-standards-from-file.prompt

[jhauga]

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 npm start and verified that README.md is up to date.

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Description

Tested the prompt using:

/write-coding-standards-from-file #file:src

where src was a folder.

The results can be seen on support-repo/CODING_STANDARDS.md. The topmost link of the file CODING_STANDARDS.md points to the folder the prompt extracted data from.

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Type of Contribution

• New instruction file.
• New prompt file.
• New chat mode file.
• New collection file.
• Update to existing instruction, prompt, chat mode, or collection.
• Other (please specify):

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Additional Notes

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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 PR adds a new agent prompt that generates coding standards documentation by analyzing existing code files or folders. The prompt extracts style patterns from the codebase and produces standardized documentation following configurable templates.

Key changes:

• New comprehensive prompt file for generating coding standards from existing code
• Integrated README documentation entry for the new prompt
• Support for multiple output formats (new file, README insertion, or prompt output)

Reviewed Changes

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

File	Description
prompts/write-coding-standards-from-file.prompt.md	New agent prompt that analyzes code files/folders and generates coding standards documentation with configurable templates and style guide references
docs/README.prompts.md	Added table entry documenting the new prompt with installation links

[jhauga]

Side note - extracted list of ### Fetch Links from awesome-guidelines.