Add Mitsubishi Comfort branding

[nikolairahimi]

Proposed change

Add icon and logo assets for the new `mitsubishi_comfort` core integration. The icon is the Mitsubishi three-diamond mark and the logo is the full Mitsubishi Electric Heating & Air Conditioning wordmark.

Type of change

• Add a new logo or icon for a new core integration
• Add a missing icon or logo for an existing core integration
• Replace an existing icon or logo with a higher quality version
• Replace an existing icon or logo after a branding change
• Removing an icon or logo

Additional information

• This PR fixes or closes issue: fixes #
• Link to code base pull request: Add Mitsubishi Comfort integration core#167472
• Link to documentation pull request: Add Mitsubishi Comfort integration documentation home-assistant.io#44516
• Link to integration documentation on our website: https://www.home-assistant.io/integrations/mitsubishi_comfort

Checklist

• The added/replaced image(s) are PNG
• Icon image size is 256x256px (`icon.png`)
• hDPI icon image size is 512x512px for (`icon@2x.png`)
• Logo image size has min 128px, but max 256px, on the shortest side (`logo.png`)
• hDPI logo image size has min 256px, but max 512px, on the shortest side (`logo@2x.png`)