Update README.md

README.md

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 In case you'd like to add some other features to the logbook or you found a bug, please open an "issue" here https://github.com/vsimakhin/web-logbook/issues with a description. I cannot promise I'll implement it or fix it at a reasonable time but at least I can take a look.
 
+<a href="https://www.buymeacoffee.com/vsimakhin" target="_blank"><img src="https://cdn.buymeacoffee.com/buttons/v2/default-yellow.png" alt="Buy Me A Coffee" style="height: 60px !important;width: 217px !important;" ></a>
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 # Contributors
 
 * [@Jacopx](https://github.com/Jacopx), [@dimoniet](https://github.com/dimoniet), [@maesteve](https://github.com/maesteve), [@ken340](https://github.com/ken340) - bug reports, testing, and new functionality suggestions