update doc

java/README.md

@@ -22,3 +22,5 @@ python -m paddle_serving_server_gpu.serve --model uci_housing_model --thread 10
 ```
 java -cp paddle-serving-sdk-java-examples-0.0.1-jar-with-dependencies.jar PaddleServingClientExample fit_a_line
 ```
+
+The Java example also contains the prediction client of Bert, Model_enaemble, asyn_predict, batch_predict, Cube_local, Cube_quant, and Yolov4 models.

java/README_CN.md

@@ -22,3 +22,5 @@ python -m paddle_serving_server_gpu.serve --model uci_housing_model --thread 10
 ```
 java -cp paddle-serving-sdk-java-examples-0.0.1-jar-with-dependencies.jar PaddleServingClientExample fit_a_line
 ```
+
+java示例中还包含了bert、model_enaemble、asyn_predict、batch_predict、cube_local、cube_quant、yolov4模型的预测客户端。