Update README.md

README.md

@@ -14,9 +14,14 @@ pip install git+https://github.com/PaddlePaddle/X2Paddle.git@develop
 ```
 
 ## How To Use
+### TensorFlow
 ```
 x2paddle --framework=tensorflow --model=tf_model.pb --save_dir=pd_model
 ```
+### Caffe
+```
+x2paddle --framework=caffe --proto=deploy.proto --weight=deploy.caffemodel --save_dir=pd_model
+```
 
 ## Related Docs
 [1. 如何导出TensorFlow的pb模型](export_tf_model.md)