Translated version of model_sharing.mdx doc to spanish
# What does this PR do?
This PR is related to #15947  issue.

This PR translates the model_sharing.mdx file to a spanish version of it and save it into transformers\docs\source_es path. This translation tries to keep the structure and ideas behind each statement, adding some words and translation where there's not specific one-to-one translation in Spanish, in other cases it adds words for a better flow of ideas. 

Any comment with respect to this translation is welcome while we try to figure out the better way to give Spanish-speaker community the best documentation about HuggingFace. 

Thank you.

_The documentation is not available anymore as the PR was closed or merged._<|||||>Thanks, @Gerard-170! I will review it during the week :)<|||||>Hola @Gerard-170! I just wanted to follow up with your PR 🤗! Please let me know if you need anything else.<|||||>Hi! @omarespejel  Well I was waiting the review. whether you have some comments about the translation or not. Let me know what you think! and Happy to contribute!! Thank you! :D <|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md) are likely to be ignored.<|||||>Hi @Gerard-170! Thank you 🤗. I left above my review.

Also, could you please add `model_sharing` to [`transformers/docs/source/es/_toctree.yml`](https://github.com/huggingface/transformers/blob/main/docs/source/es/_toctree.yml)? As a reference, you can use the [new Translation](https://github.com/huggingface/transformers/blob/main/docs/TRANSLATING.md) guide (section "✍️ Start translating"). This would allow the tests to pass.<|||||>Hi! Sorry for a late response, of course I will add model_sharing to [transformers/docs/source/es/_toctree.yml](https://github.com/huggingface/transformers/blob/main/docs/source/es/_toctree.yml). <|||||>Thank you @Gerard-170! Also please run `git pull upstream master` to merge all the changes made to `main` (note we recently went from `master` to `main`, and this is still not reflected in your fork).<|||||>Hola @Gerard-170! Muchas gracias. It looks great, there is a style error that we recently corrected in another file. Could you please run `git pull upstream main` again so this gets corrected? I think this will do the trick.<|||||>Hola @omarespejel Yes! I did again git pull and all checks have passed! :D Please let me know if you need something else. Gracias! <|||||>Thank you @Gerard-170! This is great 🤗.

@sgugger LGTM 👍 