Improve Windows + WSL build documentation

Hi 👋  

I recently built CCExtractor on Windows using WSL (Ubuntu) and noticed that
the Windows/WSL build steps and required dependencies are not documented
in one place.

I’d like to submit a small documentation PR summarizing:
- Complete WSL setup
- Required dependencies (Rust, libclang, tesseract, gpac)
- Common build errors and fixes

Does that sound okay?
Thanks!
