Transfer ypywidgets

[davidbrochart]

Target

ypywidgets provides a new Ypy-based backend for attribute synchronization, allowing for collaborative widgets.

• The code repository: https://github.com/davidbrochart/ypywidgets
• The npm package on npmjs.com (if available): N/A
• The python package on pypi.org (if available): https://pypi.org/project/ypywidgets
• The conda-forge recipe on https://github.com/conda-forge (if available): https://github.com/conda-forge/ypywidgets-feedstock
• The documentation website (if available): N/A

Reason

Since ypywidgets is similar to (a subset of) ipywidgets, I think it is very relevant for it to live in this organization. We might even want ipywidgets to optionally use ypywidgets under the hood.

Checklist

• You are owner of the repository you want to transfer
• Which role do you want to have in the jupyter-widgets-contrib organization (check one of):
  • Help with all jupyter-widgets-contrib repositories
  • Help with the transferred repository only
  • I don't have time anymore to keep helping the project
• The transferred repository (check one of):
  • Must keep the extension name
  • Cannot use the original name
  • I don't care
• The code is available under a Open Source license
• A license file is present in the code repository
• The repository contains a README file describing:
  • The provided feature(s)
  • A picture illustrating the feature(s)
  • The available options/settings (if applicable)
  • How to install the extension
  • optional a Binder link to test the feature online
• optional The frontend code (Typescript/Javascript) is tested
• optional The backend code (Python) is tested
• I certify the extension is not using exclusively paid-plan of any commercial service
• I will help the transfer process on the code repository AND the built packages

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