chore: readme and china region api base url (#21)

Co-authored-by: zhengweijun <weijun.zheng@aminer.cn>

README.md

@@ -77,6 +77,16 @@ pip install zai-sdk
 ## 🚀 Quick Start
 
 ### Create API Key
+
+#### Get API Key
+- **Overseas regions**: Visit [Z.ai Open Platform](https://docs.z.ai/) to get your API key
+- **Mainland China regions**: Visit [Zhipu AI Open Platform](https://www.bigmodel.cn/) to get your API key
+
+#### API BASE URL
+- **Mainland China regions**: `https://open.bigmodel.cn/api/paas/v4/`
+- **Overseas regions**: `https://api.z.ai/api/paas/v4/`
+
+#### Usage Steps
 1. **Create client with API key**
 2. **Call the corresponding API methods**
 
@@ -85,11 +95,14 @@ For complete examples, please refer to the open platform [API Reference](https:/
 ### Basic Usage
 
 ```python
-from zai import ZaiClient
+from zai import ZaiClient, ZhipuAiClient
 
-# Initialize client
+# For Overseas users, create the ZaiClient
 client = ZaiClient(api_key="your-api-key")
 
+# For Chinese users, create the ZhipuAiClient
+client = ZhipuAiClient(api_key="your-api-key")
+
 # Create chat completion
 response = client.chat.completions.create(
     model="glm-4",

README_CN.md

@@ -76,13 +76,45 @@ pip install zai-sdk
 
 ## 🚀 快速开始
 
-### 基本用法
+### 创建 API Key
+
+#### 获取 API Key
+- **海外区域**: 访问 [Z.ai 开放平台](https://docs.z.ai/) 获取 API Key
+- **中国大陆区域**: 访问 [智谱 AI 开放平台](https://www.bigmodel.cn/) 获取 API Key
+
+#### API BASE URL
+- **中国大陆区域**: `https://open.bigmodel.cn/api/paas/v4/`
+- **海外区域**: `https://api.z.ai/api/paas/v4/`
+
+#### 使用步骤
 
 1. **使用API密钥创建客户端**
 2. **调用相应的API方法**
 
 完整示例请参考开放平台[接口文档](https://docs.z.ai/api-reference/)以及[使用指南](https://docs.z.ai/guides/)，记得替换为您自己的API密钥。
 
+### 基本用法
+### Basic Usage
+
+```python
+from zai import ZaiClient, ZhipuAiClient
+
+# 对于海外用户，使用ZaiClient
+client = ZaiClient(api_key="your-api-key")
+
+# 对于中国大陆用户，使用ZhipuAiClient
+client = ZhipuAiClient(api_key="your-api-key")
+
+# Create chat completion
+response = client.chat.completions.create(
+    model="glm-4",
+    messages=[
+        {"role": "user", "content": "Hello, Z.ai!"}
+    ]
+)
+print(response.choices[0].message.content)
+```
+
 ### 客户端配置
 
 SDK支持多种方式配置API密钥：