build: added GitHub CoPilot instructions

Author: thorsten

.github/copilot-instructions.md

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+# Project Overview
+
+This project is a web application that allows users to manage FAQs. 
+It is built using HTML5, CSS, TypeScript, and PHP, and supports various databases for data storage.
+Supported databases include MySQL, PostgreSQL, SQLite3, and MS SQL.
+Supported search engines include Elasticsearch, and OpenSearch.
+Supported web servers include Apache, Nginx, and IIS.
+
+## Folder Structure
+
+- `/phpmyfaq/admin`: Contains the source code for the admin.
+- `/phpmyfaq/`: Contains the source code for the frontend.
+- `/phpmyfaq/src/phpMyFAQ`: Contains the source code for the PHP backend.
+- `/docs`: Contains documentation for the project, including API specifications and user guides.
+- `/tests`: Contains PHPUnit v12 based unittests.
+
+## Libraries and Frameworks
+
+- HTML 5, CSS, TypeScript, Bootstrap, and Bootstrap Icons for the frontend.
+- PHP with Symfony components for the backend.
+- MySQL, PostgreSQL, SQLite3, and MS SQL for data storage.
+
+## Coding Standards
+
+- Use PSR-12 coding standards for PHP code.
+- Use TypeScript coding standards for TypeScript code.
+- Use HTML5 and CSS3 standards for frontend code.
+- Use semicolons at the end of each statement.
+- Use single quotes for strings.
+- Use arrow functions for callbacks.
+
+## UI guidelines
+
+- Application should have a modern and clean design.