Revise README to enhance project description and installation instructions

[shibayan]

This pull request significantly improves the README.md to provide a clearer, more engaging, and user-friendly introduction to WinQuickLook. The new documentation highlights the app's features, modernizes the overview, and offers detailed installation and usage instructions. It also encourages community involvement and support.

Documentation improvements:

• Added an "Overview" section describing WinQuickLook's purpose and how it brings macOS Quick Look functionality to Windows, including a new tagline and summary. [1] [2]
• Introduced a "Features" section outlining key benefits such as fast previews, wide format support, lightweight design, and seamless integration with Windows File Explorer.
• Expanded installation instructions with clear Microsoft Store and WinGet options, including command examples and recommendations.
• Added "Quick Start" and "Use Cases" sections to guide new users and illustrate practical scenarios for using the app.
• Included sections for contributing, license, and ways to support the project, making it easier for users to get involved and show appreciation.