Add icon and logo for pollen.lu custom integration

[Foxi352]

Proposed change

Added icon and logo for pollen.lu custom integration. The integration can be found here: https://github.com/Foxi352/hacs_pollen_lu

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
• [x] Add a new logo or icon for a custom integration (custom component)
  • [x] 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

• 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/Foxi352/hacs_pollen_lu

Checklist

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