Update README.md

README.md

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 [![Build Status](https://travis-ci.org/blue-jam/rime-docker.svg?branch=master)](https://travis-ci.org/blue-jam/rime-docker)
 
 A docker image including rime, C++, Java, Kotlin, and Python.
+
+[Docker Hub](https://hub.docker.com/r/bluejamkmy/rime-docker)
+
+## Usage
+
+You may have to run `docker` commands as a super user.
+
+1. Pull `rime-docker` image from Docker Hub by
+
+   ```
+   $ docker pull bluejamkmy/rime-docker
+   ```
+
+1. Save [`Dockerfile`](Dockerfile.example) in your rime project directory:
+
+   ```Dockerfile
+   FROM bluejamkmy/rime-docker
+
+   COPY . /rime_project
+
+   WORKDIR /rime_project
+   ```
+
+1. Build a docker image for your project by
+
+   ```
+   $ docker build -t myrime .
+   ```
+
+1. Run your container by
+
+   ```
+   $ docker run -it myrime rime test
+   ```