accept donations

[baruchRepo]

The idea is to add a donation/sponsorship option to Flet.

Hello Flet team,

I think Flet would greatly benefit from having a formal way to receive support:

• A sponsorship button (GitHub Sponsors / Open Collective).
• A Sponsors section in the README or on the website, highlighting donors.
• Acknowledgment in the docs or website (logos, names).

This would make it easier for companies and individual users to contribute to the acceleration and growth of the project.

Thank you for your great work. I truly hope this grows, as the project has enormous potential!