Add plugin icon for Codex marketplace display

[internet-dot]

Your plugin is listed in the awesome-codex-plugins marketplace, but it's missing an icon. Plugins with icons display better inside the Codex app when users browse the marketplace.

What to add:

1. Add an icon file (SVG preferred, PNG also works) to your repo under assets/. Recommended: 512x512px, simple design that reads well at small sizes.

2. In your .codex-plugin/plugin.json, add the composerIcon field inside the interface object:

{
  "interface": {
    "composerIcon": "./assets/your-icon.svg",
    ...
  }
}

3. Open a PR against hashgraph-online/awesome-codex-plugins that:
   • Adds the "icon" field pointing to the local path in marketplace.json (e.g. "icon": "./plugins/OWNER/REPO/assets/your-icon.svg")
   • Includes your icon file in the plugins/OWNER/REPO/assets/ directory

Reference: Look at any plugin that already has an icon in the marketplace for the expected structure.

No rush, but it'll make your plugin stand out more in the marketplace browser.