Update README with comprehensive project information

[Copilot]

Enhanced the repository's README.md from a minimal placeholder to a comprehensive, professional documentation that properly describes the project.

Changes Made

• Added project description: Clear explanation that this is a repository for publishing and sharing content
• Added Description section: Detailed information about the project's purpose as a basic publishing platform
• Added Features section: Highlighted key characteristics including simple structure, easy navigation, and lightweight setup
• Added Getting Started section: Basic instructions for users to clone and start using the repository
• Added Contributing section: Encouragement for community participation through issues and pull requests
• Preserved existing image: Maintained the original screenshot that was already in the README

Before

# mypub
tada
tada tada
<img...>

After

The README now includes proper sections with meaningful content that explains what the project is for and how to use it, transforming it from placeholder text into useful documentation.

Fixes #2.

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