Add 'how to add to OpenRemote' instructions to the README.md

[dominiquekleeven]

Provide instructions on how to add the service to the OpenRemote stack.

• Adding the service to the OpenRemote docker compose file
• Setting up the HAProxy to use a custom config
• Show

Refer to docs.openremote.io for additional details/information on services/external services.

[dominiquekleeven]

Should also include a reference to the version of OpenRemote that is supported e.g. >=1.8.2

We should be able to add this as a metadata entry to the pyproject.toml