Add Uruky as gold sponsor [ci skip]

README.md

@@ -17,7 +17,13 @@ Cryptomator is provided free of charge as an open-source project despite the hig
 
 ### Gold Sponsors
 
-Become our Gold Sponsor and showcase your brand to a targeted audience! Please contact us if you are interested.
+<table>
+  <tbody>
+    <tr>
+      <td><a href="https://uruky.com/"><picture><source media="(prefers-color-scheme: dark)" srcset="https://cryptomator.org/img/sponsors/uruky-white.svg"><img src="https://cryptomator.org/img/sponsors/uruky.svg" alt="Uruky" height="80"></picture></a></td>
+    </tr>
+  </tbody>
+</table>
 
 ### Silver Sponsors