complete readme

README.md

@@ -23,6 +23,19 @@ Auto renew access tokens after 20 days
 
 Caution! please use unblocked ip for authentication, first login to `https://chat.openai.com/` to check ip availability if you can.
 
+### API Authentication (Optional)
+
+Custom API keys for this fake API, just like OpenAI api
+
+`api_keys.txt` - A list of API keys separated by new line
+
+Format:
+```
+sk-123456
+88888888
+...
+```
+
 ## Getting set up
 ```  
 git clone https://github.com/xqdoo00o/ChatGPT-to-API

README_ZH.md

@@ -24,6 +24,19 @@
 
 注意！ 请使用未封锁的ip登录账号，请先打开浏览器登录`https://chat.openai.com/`以检查ip是否可用
 
+### API 密钥（可选）
+
+如OpenAI的官方API一样，可给模拟的API添加API密钥认证
+
+`api_keys.txt` - 存放API密钥的文件
+
+格式:
+```
+sk-123456
+88888888
+...
+```
+
 ## 开始
 ```  
 git clone https://github.com/xqdoo00o/ChatGPT-to-API