fix: fix README.md

Author: JLY2015

README.md

@@ -30,6 +30,7 @@ The code demo:
     obTableClient.setParamURL("param_url");
     obTableClient.setPassword("password");
     obTableClient.setSysUserName("sys_user_name");
+    obTableClient.setSysPassword("sys_user_passwd");
     obTableClient.init();
 
     // 2. single execute
@@ -50,8 +51,8 @@ The code demo:
     // the results include 3 item: 1. affectedRows; 2. Map; 3. affectedRows.
 ```
 **NOTE:**
-param_url is generated by ConfigServer (link TODO).
-
+1. param_url is generated by ConfigServer (link TODO).
+2. More example [Demo](https://github.com/oceanbase/obkv-table-client-java/tree/master/example) 
 ## Documentation
 
 - English [Coming soon]