修改文档说明

README.md

@@ -43,13 +43,17 @@ String tableId = operation.createTable("HelloTable", "#分组Id（可选）");
 
 ### 更新表数据
 
-数据的格式采用csv文件存储，格式如下，假设文件名为data.csv,其内容为：
+数据的格式采用csv文件存储，格式如下，假设文件名为data.csv，其内容为（其中第一行是表头，第一行之后是表数据）：
 
 ```
 "合同签约时间(Year Month Day)","城市","国家","客户名称","省份","回款金额","合同金额"
 "18/1/2016","杭州市","中国","浙江臻善科技有限公司","浙江省","1200000","1200000"
+"1/8/2016","郑州市","中国","杭州明佑电子有限公司","河南省","100800","100800"
+"1/4/2016","西安市","中国","西北工业大学","陕西省","430000","430000"
 ```
 
+**注意：** 当前暂时不支持追加数据，仅支持全部替换数据。
+
 ```java
 Authentication authentication = new Authentication("#key", "#secret");
 DatasourceOperation operation = new DatasourceOperation(authentication);