docs: Add docs.json and markdown documentation

[Lantum-Brendan]

Task

This app needs documentation to appear on developers.whilesmart.com under the Apps section.

The site fetches docs from a docs.json manifest plus markdown files in a docs/ folder at runtime.

Action

• Create docs.json manifest (see template below)
• Create docs/installation.md with real install command
• Create docs/usage.md with basic usage example
• Push to default branch

Template docs.json

{
  "": "https://raw.githubusercontent.com/whilesmart/docs-kit/main/schema/docs.schema.json",
  "name": "Project Name",
  "description": "Short description",
  "icon": "lucide-icon-name",
  "category": { "language": "go" },
  "sidebar": [
    { "title": "Installation", "path": "docs/installation.md" },
    { "title": "Usage", "path": "docs/usage.md" }
  ]
}

Note: For app, category.framework is optional (omit for CLI/tools).

Acceptance

• docs.json validates against schema
• Referenced markdown files exist
• Project appears on /apps listing with docs rendering