message: mention Git LFS in the docs
diff: @@ -9,7 +9,8 @@ release.
  Prerequisites
  -------------
  -You can clone the latest Intel Open Image Denoise sources via:
  +You can clone the latest Intel Open Image Denoise sources using Git with the
  +Git Large File Storage (LFS) extension:
  git clone --recursive https://github.com/OpenImageDenoise/oidn.git
  