docs: Update server tools section to list supporting platforms

Author: OskarStark

README.md

@@ -172,9 +172,11 @@ $response = $chain->call($messages, [
 To integrate LLMs with your application, LLM Chain supports [tool calling](https://platform.openai.com/docs/guides/function-calling) out of the box.
 Tools are services that can be called by the LLM to provide additional features or process data.
 
-#### Server Tools (Google Gemini)
+#### Server Tools
 
-Google Gemini provides built-in server-side tools for enhanced capabilities without custom implementations. See the [Server Tools Documentation](docs/google-server-tools.md) for detailed usage instructions.
+Some platforms provide built-in server-side tools for enhanced capabilities without custom implementations:
+
+1. **Google Gemini** - URL Context, Google Search, Code Execution. See the [Server Tools Documentation](docs/google-server-tools.md) for detailed usage instructions.
 
 Tool calling can be enabled by registering the processors in the chain: