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 :-)

[griwodz]

I tried to add some more CUDA considerations.