fixes #42: FFmpeg Build Error for ffmpeg-sys-next in Rust

[Ni1esh-Yadav]

Summary

This PR provides a fix for the FFmpeg build error encountered when compiling Rust projects that depend on ffmpeg-sys-next. The issue arises due to missing FFmpeg development files, incorrect environment configurations, or missing .pc files required by pkg-config.

Changes

• Added step-by-step instructions for installing FFmpeg via vcpkg (recommended for Windows).
• Included environment variable setup to ensure proper library detection.
• Removed unnecessary details for a more concise and actionable guide.

Why This Fix?

Using vcpkg simplifies FFmpeg installation, resolves linking issues, and ensures compatibility with Rust's build system. This approach reduces manual configuration errors and makes it easier for developers to integrate FFmpeg into their Rust projects.

Testing

• Verified that cargo build completes without errors.

[dmtrKovalenko]

look okay to me but why are you installing it suing vcpkg instead of building from source using build feature