AI coding conventions

[simogasp]

This is a first draft for the coding convention for the AI agents that may contribute to the code (Copilot, GPT, Claude etc).

The idea is to define the coding rules to follow in the markdown file at the root of the project (well, those should be followed by "human" contributors too :) )

The copilot-guidelines.md simply refer to this one. Like that, other AI can share the same set of rules without repeating them in other files.

Please comment, add, improve :)

PS
Ca va sans dire, it has been generated with the help of ChatGPT :-)

[Copilot]

Pull Request Overview

This PR introduces AI-specific coding conventions for the PopSift project by creating a comprehensive development guide that establishes consistent standards for AI-assisted code generation. The guide covers C++17 best practices, CUDA development patterns, threading guidelines, and project organization standards.

Key changes:

• Establishes comprehensive coding standards for AI-assisted development covering C++, CUDA, threading, and documentation
• Creates a reference-based system where GitHub Copilot instructions point to the main guide
• Defines consistent naming conventions, error handling patterns, and performance optimization guidelines

Reviewed Changes

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

File	Description
AI_DEVELOPMENT_GUIDE.md	New comprehensive coding standards document covering C++17, CUDA, threading, performance, documentation, and testing guidelines
.github/copilot-instructions.md	New minimal reference file directing to the main AI development guide

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_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[griwodz]

I tried to add some more CUDA considerations.