Added Xiaomi Air Purifier 3/3H (2019)

[foxel]

Proposed change

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logo's and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase: Add support for Mi AirPurifier 3 core#31729
• Link to parent pull request in the Brands repository: N/A
• This PR fixes or closes issue: N/A

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

[frenck]

Thanks, @foxel! 👍

[nhok3296]

Has this integration been used yet?

[frenck]

@nhok3296 If you need to support or have questions, please check: https://www.home-assistant.io/help. Thanks 👍