Add generic code review instructions

[alineavila]

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

This PR adds a generic code review instruction file that can be reused across any project using GitHub Copilot.

Key Features

• Multi-language support (JavaScript, Python, Java, TypeScript)
• Three priority levels (Critical, Important, Suggestion)
• Comprehensive coverage: security, performance, architecture, testing
• Structured comment format template
• Highly customizable for project-specific needs
• Based on GitHub Copilot prompt engineering best practices

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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

Testing: Tested with Java/Spring Boot microservices and multiple programming languages.

Differentiation: Provides a generic, framework-agnostic approach with educational examples (wrong ❌ vs correct ✅ code) and comprehensive security, performance, and architecture checks.

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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 comprehensive generic code review instruction file that provides reusable guidelines for GitHub Copilot across any project. The instruction file covers security, performance, testing, architecture, and code quality standards with concrete examples in multiple programming languages (JavaScript, Python, Java, TypeScript). The contribution follows the repository's naming conventions and includes proper README documentation.

Key Changes

• New instruction file with extensive code review guidelines organized by priority levels (Critical, Important, Suggestion)
• Multi-language examples demonstrating good and bad practices across common review categories
• README updated to include the new instruction in alphabetical order with proper install badges

Reviewed changes

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

File	Description
instructions/code-review-generic.instructions.md	New comprehensive code review instruction file with guidelines covering security, performance, testing, architecture, and code quality standards with concrete examples
docs/README.instructions.md	Added entry for the new generic code review instructions in alphabetical order with proper formatting and install links

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