Create FUNDING.yml

[fcollonval]

This will add the following badge on the repositories homepage (see https://github.com/jupyterlab/jupyterlab):

This is similar to what conda-forge has set up.

[welcome]

Thanks for submitting your first pull request! You are awesome! 🤗

If you haven't done so already, check out Jupyter's Code of Conduct. Also, please make sure you followed the pull request template, as this will help us review your contribution more quickly.

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Welcome to the Jupyter community! 🎉