Update README.md

Add more user direction.

Author: hantmac

README.md

@@ -15,12 +15,21 @@ The detail introduction docs available in [docs page](./docs/docs.md)
 - Clone from repo: `git clone https://github.com/databendcloud/databend-kafka-connect.git`
 - From the root of the project:
     - Build and package debezium server: `mvn -Passembly -Dmaven.test.skip package`
-    - After building, you will get the jar file in `target` dir. Just put it into kafka libs dir.
+    - After building, you will get the jar files in `target` dir. Or download the package jar files from [release](https://github.com/databendcloud/databend-kafka-connect/releases) Just put it into kafka libs dir.
     - Create `databend.properties` file in kafka config dir and config it: `nano config/databend.properties`, you can check the example
       configuration
       in [application.properties.example](src/main/resources/conf/application.properties.example)
     - config your source connect such as kafka mysql connector
-    - Start or restart the Kafka Connect workers.: `bin/connect-standalone.sh config/connect-standalone.properties config/databend.properties config/mysql.properties`
+    - if you sync data from kafka topic directly, please confirm the data format from kafka topic, for example, if your data if AVRO format, you should add the following config into config properties:
+ 
+  ```
+    key.converter=org.apache.kafka.connect.storage.StringConverter
+    value.converter=io.confluent.connect.avro.AvroConverter
+    value.converter.basic.auth.credentials.source=USER_INFO
+    value.converter.schema.registry.basic.auth.user.info=xxxx
+    value.converter.schema.registry.url=https://your-registry-url.us-east-2.aws.confluent.cloud
+  ```
+  - Start or restart the Kafka Connect workers.: `bin/connect-standalone.sh config/connect-standalone.properties config/databend.properties config/mysql.properties`
 
 More details about configure kafka connector, please read [Configure Self-Managed Connectors](https://docs.confluent.io/platform/current/connect/configuring.html).