Update app-shell usage documentation

packages/app-shell/README.md

@@ -12,10 +12,21 @@ npm i @dbp-toolkit/app-shell
 ## Usage
 
 ```html
-<dbp-app-shell src="/example.topic.metadata.json"></dbp-app-shell>
 <script type="module" src="node_modules/@dbp-toolkit/app-shell/dist/dbp-app-shell.js"></script>
+<dbp-app-shell src="/example.topic.metadata.json"></dbp-app-shell>
+```
+
+Or directly via CDN:
+
+```html
+<script type="module" src="https://unpkg.com/@dbp-toolkit/app-shell@0.2.3/dist/dbp-app-shell.js"></script>
+<dbp-app-shell src="/example.topic.metadata.json"></dbp-app-shell>
 ```
 
+You need Keycloak and other parts to be in place to really make full use of the AppShell.
+Best take a look on examples like [index.html](https://gitlab.tugraz.at/dbp/esign/signature/-/blob/master/examples/dbp-signature/index.html)
+for more explanation.
+
 ## Attributes
 
 - `lang` (optional, default: `de`): set to `de` or `en` for German or English

packages/app-shell/package.json

 {
   "name": "@dbp-toolkit/app-shell",
   "homepage": "https://gitlab.tugraz.at/dbp/web-components/toolkit/-/tree/master/packages/app-shell",
-  "version": "0.2.3",
+  "version": "0.2.4",
   "main": "src/index.js",
   "license": "LGPL-2.1-or-later",
   "repository": {