Add notice about Sonar 3.0 to README

Author: jonesdevelopment

.github/README.md

@@ -26,6 +26,12 @@
   [License](https://github.com/jonesdevelopment/sonar/?tab=readme-ov-file#license)
 </div>
 
+> ### Notice about Sonar 3.0
+> 
+> We're excited to announce the public release of Sonar 3.0.
+> If you are interested, please check out https://sonar.top/. You can read more about what sets Sonar 3.0 apart from Sonar 2.0 [here](<https://docs.sonar.top/faq>).
+> If you want more robust protection, better performance, and awesome new features, check out Sonar 3.0!
+
 ## Design and Goal
 * Effective, lightweight, and easy-to-use
 * No unnecessary features and clean code