Documentation request: example of complete docker compose use case

[byron-hawkins]

On the welcome page, there is a suggestion that Flask-Shell2HTTP can be useful for docker-to-docker communication. However, git grep -i "docker! returns basically nothing. It would be very helpful to have a complete working example of a docker compose multi-service configuration that uses flask-Shell2HTTP between two running containers in the application. Especially important is the compose.yml file and the specific (concretely defined and implemented) command to submit a request from one container to a REST endpoint running in another container within the composed network of service.