Add Franklin WH icons

[richo]

Proposed change

Add the logos for the franklin WH whole house battery system

My integration is here (hacs is on a branch and not merged yet while I wait for the checker to get fixed): https://github.com/richo/homeassistant-franklinwh/tree/hacs

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
• Add a new logo or icon for a custom integration (custom component)
  • I've added a link to my custom integration repository in the PR description
  • I've opened up a PR for my custom integration on the Home Assistant
    Python wheels repository
• 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

Working toward getting my Franklin integration into hacs to make it easier for some of my users to install, sorry if I have created some circular dependencies I'm sort of working through this as I go.

• This PR fixes or closes issue: fixes #
• Link to code base pull request:
• Link to documentation pull request:
• Link to integration documentation on our website:
• Link to custom integration repository: https://github.com/richo/homeassistant-franklinwh/tree/hacs

Checklist

• The added/replaced image(s) are PNG
• Icon image size is 256x256px (icon.png)
• hDPI icon image size is 512x512px for ([email protected])
• 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 ([email protected])

I couldn't find any good logos for them.