[ENH] Missing Dockerfile for template-project

[Aran30]

1. Motivation - Most (if not all) las2peer services are programmed and then used in a virtualized cluster environment. This leads to the necessity of having "images" of created services. It would be helpful, if the template-project service would contain a template Dockerfile as well, making the development of new services easier.
2. Specification - Create Dockerfile and docker-entrypoint.sh file.
3. Finalised state - Las2peer developers have an easier time creating an image of their service.