Update README.md

Add apijson-db2 demo

Author: andream7

README.md

@@ -450,6 +450,10 @@ https://github.com/Tencent/APIJSON/blob/master/CONTRIBUTING.md
 APIJSON- 后端零代码接口和文档ORM库 <br />
 https://lexiangla.com/teams/k100046/classes/a4eba9f4b6d711eba2ec268dd73d15f1?type=0&company_from=79350bd4d06911ea91f05254002f1020
 
+#### zhangshukun 2.接入 presto/hive/clickhouse/db2 任意一个 
+APIJSON-Demo接入db2 <br />
+https://github.com/andream7/apijson-db2
+  
 
 ### 持续更新
 https://github.com/Tencent/APIJSON/commits/master