docs: upgrade doc with http-facade

Signed-off-by: moxiaoying <1159230165@qq.com>

Author: CennyMo

README.md

@@ -2,7 +2,7 @@
 
 ![License](https://img.shields.io/badge/license-Apache2.0-green) ![Language](https://img.shields.io/badge/language-Java-blue.svg) [![version](https://img.shields.io/github/v/tag/protocol-laboratory/pulsar-admin-java?label=release&color=blue)](https://github.com/protocol-laboratory/pulsar-admin-java/releases) [![codecov](https://codecov.io/gh/protocol-laboratory/pulsar-admin-java/branch/main/graph/badge.svg)](https://codecov.io/gh/protocol-laboratory/pulsar-admin-java)
 
-This is a simple alternative to pulsar-admin built using the built-in HTTP client of the JDK. It minimizes project dependencies and requires a minimum of JDK 8.
+This is an alternative to pulsar-admin, supporting multiple [HTTP engines](https://github.com/openfacade/http-facade?tab=readme-ov-file#httpclient-support-engines) by leveraging [http-facade](https://github.com/openfacade/http-facade).
 
 Features:
 - Basic functionality for managing Pulsar clusters