Docker/compose for local development

[juannyG]

Per https://github.com/MongoEngine/mongoengine/issues/2555 - this provides a Dockerized mongo 4 container with a replica set of 1, primed and ready to go.

If you don't have a mongo instance running already, you can use Docker

docker build -t mongoengine:latest .
docker run -it -p 27017:27017 mongoengine:latest

or docker-compose:

docker-compose build
docker-compose up