Update README.md

README.md

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 A simple window manager for DOM elements
 
+<a href='https://ko-fi.com/michaelkolesidis' target='_blank'><img src='https://cdn.ko-fi.com/cdn/kofi1.png' style='border:0px;height:45px;' alt='Buy Me a Coffee at ko-fi.com' /></a>
+
 [Demo 1](https://dom-window-manager.vercel.app/)
 
 [Demo 2](https://collection-of-div-surrogates.vercel.app/)
@@ -88,6 +90,12 @@ element.addEventListener("mousedown", () => {
 
 ```
 
+## 💖 Support the Project
+
+Thank you so much for your interest in my project! If you want to go a step further and support my open source work, buy me a coffee:
+
+<a href='https://ko-fi.com/michaelkolesidis' target='_blank'><img src='https://cdn.ko-fi.com/cdn/kofi1.png' style='border:0px;height:45px;' alt='Buy Me a Coffee at ko-fi.com' /></a>
+
 ## License
 
 <a href="https://www.gnu.org/licenses/agpl-3.0.html"><img src="https://upload.wikimedia.org/wikipedia/commons/0/06/AGPLv3_Logo.svg" height="100px" /></a>