[Upload models] Add docs for mixin (#1196)
* Add docs
* Add formatting
* Apply suggestions from code review
Co-authored-by: Pedro Cuenca <pedro@huggingface.co>
* More improvements
* Update docs
* Address comments
* Add link to upload files
* Apply suggestions from code review
Co-authored-by: Julien Chaumond <julien@huggingface.co>
* web interface first
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Co-authored-by: Pedro Cuenca <pedro@huggingface.co>
Co-authored-by: Julien Chaumond <julien@huggingface.co>
Co-authored-by: Wauplin <lucainp@gmail.com>
