Fix warning at startup with HA 0.110

VacuumDevice was renamed to VacuumEntity in latest HA 0.110.
Old name was supported but deprecated, causing warning at startup.
See: https://developers.home-assistant.io/blog/2020/05/14/entity-class-names/

First version in HACS

Documentation updates.
To be released as default HACS integration.

Initial release

v0.0.1

Typos