update README for an updated docker

Author: physhik

README.md

@@ -25,19 +25,26 @@
 
 ## Docker Installation
 
-Build the image
-
+### Build and run an image for keras-application pretrained model 
 ```shell
-cd keras-flask-deploy-webapp
-docker build -t keras_flask .
-docker run -e MODEL_PATH=models/your_model.h5 -p 5000:5000
+$ cd keras-flask-deploy-webapp
+$ docker build -t keras_flask_app .
+$ docker run -d -p 5000:5000 keras_flask_app 
 ```
 
-You can mount your model into the container.
+### Build and run an image from your model into the containeri.
+After build an image as above, and 
+```shell
+$ docker run -e MODEL_PATH=/mnt/models/your_model.h5  -v volume-name:/mnt/models -p 5000:5000 keras_flask_app
+```
 
+### Pull an built-image from Docker hub
+For your convenience, can just pull the image instead of building it. 
 ```shell
-docker run -e MODEL_PATH=/mnt/models/your_model.h5  -v volume-name:/mnt/models -p 5000:5000 keras_flask
+$ docker pull physhik/keras-flask-app:2 
+$ docker run -d -p 5000:5000 physhik/keras-flask-app:2
 ```
+Open http://localhost:5000 after waiting for a minute to install in the container.
 
 
 ## Local Installation