add Dockerfile

After setting in docker hub, you can get oacis image from docker hub (ref: http://www.atmarkit.co.jp/ait/articles/1408/26/news038.html).
Anyway you can try it by following commands.
- setup docker

  ```
  sudo yum install docker
  (ubuntu: sudo apt-get install docker.io)
  ```
- pull base image from docker hub

  ```
  sudo docker pull ubuntu
  ```
- build oacis image

  ```
  cd ~/path/to/oacis
  sudo docker build -t oacis_v1.14 .
  ```
- start the image

  ```
  sudo docker.io run -it -p 3000:3000 --name oacis1 oacis_v1.14 /bin/bash
  ```
- you can see bash console and you can access oacis from web browser(http://localhost:3000)