Added attach to configManager and `client.notifyConfigChange` message…

…s handler, Updated documentation

Added send_instance_command service, refactored open_door service, no…

…w it's internally call send_instance_command

Updated documentation

Update manifest.json

Update sensor.py

User permissions checks

Update README.md

Changes

- Remove Validate badge
- Update documentation
- Small cosmetic code changes

Update README.md

PEP8 fixes, configurable retry timeout

Create hacs.json