Add CTEK icon and logo

[Wesztman]

Proposed change

Added CTEK logos and icons to new core integration which is under development.

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

Link to fork where core integration is under development: https://github.com/ChargeStorm/core

• This PR fixes or closes issue: N/A
• Link to code base pull request: N/A
• Link to documentation pull request: N/A
• Link to integration documentation on our website: N/A
• Link to custom integration repository: N/A

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)

[frenck]

Hi there @Wesztman 👋

Since the integration is still under development (and no core PR exists yet), I'll go ahead and close this one up for now. Please feel free to re-open this PR when the upstream core & documentation PRs exist.

Thanks! 👍

../Frenck