Custom integrations. Add Ajax Systems brand

[vertsynskyi-vasyl]

Integration for the Ajax Systems devices via uartBridge https://github.com/FScoua/ha-ajax-uart

Proposed change

Add Ajax Systems brand assets (logo and icon) for use by custom integrations such as Ajax UART and future Ajax-related components.

Ajax Systems is a well-known manufacturer of professional-grade wireless and wired security systems.
These media files provide official branding for Ajax integrations in Home Assistant (Integrations UI, Devices, and HACS listings).

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
• 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/FScoua/ha-ajax-uart

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])