docs(readme): add logo

README.md

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-# Kraken
+<p align="center">
+<img src="./assets/logo.png" width=300 height=300/>
+</p>
+
+<h1 align="center">
+Kraken
+</h1>
+<br>
 
 **Kraken** is a management service built with [NestJS](https://nestjs.com/) to handle and configure instances of the **Immortal** Nostr relay. Kraken offers a centralized approach to manage the lifecycle, settings, and configurations of one or more Immortal relay instances, making it an ideal tool for high-demand relays like paid or large community relays.
 
@@ -36,4 +43,4 @@ The API and management interface will be available at the configured port. Visit
 
 ## Contributing
 
-Contributions are welcome! Please submit issues, bug reports, or pull requests to improve Kraken.
+Contributions are welcome! Please submit issues, bug reports, or pull requests to improve Kraken.