🚀 Updated README for **Social Media Downloader** with Fresh & Attractive Design

[nayandas69]

This PR introduces a revamped and visually engaging README.md for the Social Media Downloader. 🎉

Here’s what’s new:

1. Center-Aligned Title & Badges: Added a vibrant header section with all shields styled for readability and aesthetics.
2. Modern Design & Emojis: Made the README more attractive and engaging with vibes 🌟.
3. Detailed Installation Instructions: Streamlined step-by-step setup guides for Windows, Linux, and macOS.
4. FFmpeg Setup Made Easy: Clear instructions for downloading and configuring FFmpeg on all platforms.
5. Usage Section: Simple commands and batch mode examples to make downloading easy for everyone.
6. Customization Options: Highlighted how to tweak config.json for a personalized experience.
7. Contribution & Support: Encouraged collaboration with links to Issues, Discussions, and Forks.

I believe this updated version will help users understand and use the tool better while also giving it a polished look. 🌈