update readme (#505)

README.md

@@ -24,6 +24,8 @@
 
 ## 💡 Quick Start
 
+> 🌐 **Try it online now!** Experience LightX2V without installation: **[LightX2V Online Service](https://x2v.light-ai.top/login)** - Free, lightweight, and fast AI digital human video generation platform.
+
 For comprehensive usage instructions, please refer to our documentation: **[English Docs](https://lightx2v-en.readthedocs.io/en/latest/) | [中文文档](https://lightx2v-zhcn.readthedocs.io/zh-cn/latest/)**
 
 ### Installation from Git
@@ -41,7 +43,7 @@ uv pip install -v . # pip install -v .
 ### (Optional) Install Attention/Quantize Operators
 For attention operators installation, please refer to our documentation: **[English Docs](https://lightx2v-en.readthedocs.io/en/latest/getting_started/quickstart.html#step-4-install-attention-operators) | [中文文档](https://lightx2v-zhcn.readthedocs.io/zh-cn/latest/getting_started/quickstart.html#id9)**
 
-### Quick Start
+### Usage Example
 
 ```python
 # examples/wan/wan_i2v.py

README_zh.md

@@ -25,6 +25,8 @@
 
 ## 💡 快速开始
 
+> 🌐 **立即在线体验！** 无需安装即可体验 LightX2V：**[LightX2V 在线服务](https://x2v.light-ai.top/login)** - 免费、轻量、快速的AI数字人视频生成平台。
+
 详细使用说明请参考我们的文档：**[英文文档](https://lightx2v-en.readthedocs.io/en/latest/) | [中文文档](https://lightx2v-zhcn.readthedocs.io/zh-cn/latest/)**
 
 ### 从 Git 安装
@@ -42,7 +44,7 @@ uv pip install -v . # pip install -v .
 ### （可选）安装注意力/量化算子
 注意力算子安装说明请参考我们的文档：**[英文文档](https://lightx2v-en.readthedocs.io/en/latest/getting_started/quickstart.html#step-4-install-attention-operators) | [中文文档](https://lightx2v-zhcn.readthedocs.io/zh-cn/latest/getting_started/quickstart.html#id9)**
 
-### 快速开始
+### 使用示例
 ```python
 # examples/wan/wan_i2v.py
 """