docs: add consuemr demo doc

docs/en/14-reference/03-connector/04-java.mdx

@@ -1256,6 +1256,7 @@ The source code of the sample application is under `TDengine/examples/JDBC`:
 - connectionPools: using taos-jdbcdriver in connection pools such as HikariCP, Druid, dbcp, c3p0, etc.
 - SpringJdbcTemplate: using taos-jdbcdriver in Spring JdbcTemplate.
 - mybatisplus-demo: using taos-jdbcdriver in Springboot + Mybatis.
+- consumer-demo: consumer TDengine data example, the consumption rate can be controlled by parameters.
 
 [JDBC example](https://github.com/taosdata/TDengine/tree/3.0/examples/JDBC)
 

docs/zh/08-connector/14-java.mdx

@@ -1258,6 +1258,7 @@ public static void main(String[] args) throws Exception {
 - connectionPools：HikariCP, Druid, dbcp, c3p0 等连接池中使用 taos-jdbcdriver。
 - SpringJdbcTemplate：Spring JdbcTemplate 中使用 taos-jdbcdriver。
 - mybatisplus-demo：Springboot + Mybatis 中使用 taos-jdbcdriver。
+- consumer-demo：Consumer 消费 TDengine 数据示例，可通过参数控制消费速度。
 
 请参考：[JDBC example](https://github.com/taosdata/TDengine/tree/3.0/examples/JDBC)
 

examples/JDBC/consumer-demo/readme.md

@@ -4,7 +4,7 @@ TDengine's Consumer demo project is organized in a Maven way so that users can e
 sudo apt-get install maven
 ```
 
-## Install TDengine Client
+## Install TDengine Client and TaosAdapter
 Make sure you have already installed a tdengine client on your current develop environment.
 Download the tdengine package on our website: ``https://www.taosdata.com/cn/all-downloads/`` and install the client.