[Demo] Dockerfile for helloworldweb

[ahmetb]

Not to be merged. Just demoing.

Instructions:

1. Run docker build . here.
2. Save the image id produced in the last step.
3. Start the container: docker run -i -d -p 8080:8080 <imageid>
4. Head over to http://ip:8080 (ip being wherever your docker service is running)