[@portaljs/ckan][xl] - add ckan package and example using it

packages/ckan/README.md

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+# PortalJS React Components
+
+**Storybook:** https://storybook.portaljs.org  
+**Docs**: https://portaljs.org/docs  
+
+## Usage
+
+To install this package on your project:
+
+```bash
+npm i @portaljs/components
+```
+
+> Note: React 18 is required.
+
+You'll also have to import the styles CSS file in your project:
+
+```ts
+//  E.g.: Next.js => pages/_app.tsx
+import '@portaljs/components/styles.css'
+```
+
+## Dev
+
+Use Storybook to work on components by running:
+
+```bash
+npm run storybook
+```