Project Documentation Plan

Summary
This issue is opened as a discussion space for how the documentation for this project can be organized.

I opened a PR #70 as a proposal of how we can present more comprehensive docs, while @felixarntz felt that some of the suggested docs are too opinionated, so he suggested opening this issue to open discussion about the matter

What Was Added to the PR

docs/1.intro.md - Introduction and overview of the PHP AI Client SDK
docs/2.quick-start.md - Installation guide and basic usage examples
docs/3.php-applications.md - Framework integration patterns for Laravel, Symfony, and other PHP frameworks
docs/4.wordpress-integration.md - WordPress-specific features, hooks, and plugin development
docs/5.advanced-usage.md - Advanced configuration, custom providers, and optimization techniques

Expected Outcome
An agreed methodology of how this can be structured.

Start by reviewing PR #70 and the proposed documentation files: docs/1.intro.md, docs/2.quick-start.md, docs/3.php-applications.md, docs/4.wordpress-integration.md, and docs/5.advanced-usage.md. The work is done when the project agrees on a documentation structure and methodology, including how to handle concerns about opinionated content.