Add CONTRIBUTING.md file with comprehensive contribution guidelines

[Copilot]

This PR adds a CONTRIBUTING.md file to the repository to provide clear guidelines for contributors.

Changes Made

Created a comprehensive CONTRIBUTING.md file that includes:

• Getting Started: Prerequisites (Node.js, npm/yarn, Git) and step-by-step instructions for setting up the development environment
• How to Contribute: Detailed guidelines for reporting bugs, suggesting enhancements, and submitting pull requests
• Coding Standards: Best practices for code quality, commit messages, and code style
• Code Review Process: Information about the review workflow and expectations
• Development Workflow: Commands specific to this Next.js project for building, running in development mode, and running in production mode
• Questions & License: Information on how to get help and contributor license agreement

The contribution guidelines follow standard open-source best practices and are tailored specifically for this Next.js web application project, making it easy for new contributors to understand how to get involved.

Fixes the issue requesting a contribution file for the repository.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Please add a contribution.md file</issue_title>
<issue_description>Please create a contribution file

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.