* Add comprehensive WordPress development instructions for Copilot
- Introduced a detailed guide covering core principles, coding standards, security practices, internationalization, performance optimization, admin UI, REST API, block development, asset loading, testing strategies, and documentation best practices.
- Emphasized the importance of following WordPress Coding Standards (WPCS) and provided examples for plugin headers, linting setup, and security measures.
- Included a checklist to ensure compliance with best practices for plugin development.
* Add WordPress development instructions for Copilot, detailing coding, security, and testing rules for plugins and themes
* Fix formatting inconsistencies in WordPress instructions file by changing double quotes to single quotes for 'applyTo' and 'description' fields.
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