docs: update README

README.md

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 > [!WARNING]
 > Zerobyte is still in version 0.x.x and is subject to major changes from version to version. I am developing the core features and collecting feedbacks. Expect bugs! Please open issues or feature requests
 
+<p align="center">
+<a href="https://www.buymeacoffee.com/nicotsx" 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>
+</p>
+
 ## Intro
 
 Zerobyte is a backup automation tool that helps you save your data across multiple storage backends. Built on top of Restic, it provides an modern web interface to schedule, manage, and monitor encrypted backups of your remote storage.