Add donation links to active developers / supporters

[vmario89]

The active people of the project should be visible in README and/or application to give some bio/donation links like buymeacoffee. Maybe we can add them at a fitting place

some examples to possibly link:

• https://buymeacoffee.com/jappyjan
• https://coff.ee/vmario89
• https://github.com/sponsors/vmario89
• ...

i also started to make an opencollective account but this needs refinement atm