add gr.Success and update windows contributing (#10262)
* include windows contributions
* add gr.Success
* add changeset
* contributing
* changes
* clean docstring
* format
* fix typo
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Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>
Co-authored-by: Abubakar Abid <abubakar@huggingface.co>
