add playground link (#1078)

README.md

@@ -55,7 +55,10 @@ The high-level architecture and main process flow is as follows:
 - **Chat Plugin:** extends functionality with third-party tools. The LLM is going to select the most suitable one, given all configured plugins with function description and sample questions.
 
 ## Quick Demo
+### Online playground
+Visit http://117.72.46.148:9080 with username/password: admin/admin. Please do not modify system configurations. We will restart to reset configurations regularly every weekend.
 
+## Local build
 SuperSonic comes with sample semantic models as well as chat conversations that can be used as a starting point. Please follow the steps: 
 
 - Download the latest prebuilt binary from the [release page](https://github.com/tencentmusic/supersonic/releases)

README_CN.md

@@ -52,6 +52,11 @@ SuperSonic的整体架构和主流程如下图所示：
 
 ## 快速体验
 
+### 线上环境体验
+访问http://117.72.46.148:9080 用户名/密码:admin/admin. 请勿修改系统配置。我们每周末定期重启重置配置。
+
+### 本地构建
+
 SuperSonic自带样例的语义模型和问答对话，只需以下三步即可快速体验：
 
 - 从[release page](https://github.com/tencentmusic/supersonic/releases)下载预先构建好的发行包