Add copilot instructions

Author: nullforce

.github/copilot-instructions.md

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+# Project Description
+
+This project is an educational website for sharing homework assignments and coding exercises with students. Students can browse, view, and download assignments directly from the portal.
+
+## Project Structure
+
+- [`assignments/`](../assignments/) Each homework assignment is stored in its own subfolder with a consistent structure.
+- [`templates/`](../templates/) Reusable templates for new content
+- [`assets/`](../assets/) Contains the website assets including CSS, JavaScript, images, and configuration files
+- [`index.html`](../index.html) The main website page that serves as a static portal for browsing and viewing assignments. Content is configurable via [`config.json`](../config.json) file to dynamically generate assignment lists and details.
+
+## Project Guidelines
+
+- Maintain consistent styling across all pages
+- Keep file and folder names descriptive and organized
+
+## Educational Standards
+
+When generating content for this project:
+
+- **Learning-focused**: All content should be designed with clear learning objectives and appropriate difficulty levels
+- **Student-friendly**: Use clear, encouraging language that motivates students