Provide examples for more complex action spaces

[slinlee]

The policy server currently supports discrete tuple action spaces. To help test support for different actions, it will help if we have examples. Here are some that we need:

• continuous actions
• mixed discrete and continuous

[ejunprung]

@slinlee I don't have a pure continuous example but for mixed, I'd try https://help.pathmind.com/en/articles/4755439-bass-diffusion-marketing-model.

We can also try multi-agent too. https://help.pathmind.com/en/articles/4694248-automated-guided-vehicle-agv

[slinlee]

cool, that's a good start. thanks