[FEATURE] Add live demo (#203)

Enable live demo for app.

.github/workflows/deploy.yml

@@ -0,0 +1,24 @@
+name: Deploy
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Setup Node.js environment
+      uses: actions/setup-node@v3
+      with:
+        node-version: 20
+
+    - run: npm install
+    - run: npm run build
+
+    - name: GitHub Pages action
+      uses: peaceiris/actions-gh-pages@v3
+      with:
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+        publish_dir: dist

README.md

@@ -5,6 +5,9 @@
 
 [![REUSE status](https://api.reuse.software/badge/github.com/SAP/openui5-sample-app)](https://api.reuse.software/info/github.com/SAP/openui5-sample-app)
 
+## Live Demo
+A deployed version of the [openui5-sample-app](http://sap.github.io/openui5-sample-app/index.html) is hosted on GitHub Pages.
+
 ## Prerequisites
 - The **UI5 CLI** of the [UI5 Tooling](https://github.com/SAP/ui5-tooling#installing-the-ui5-cli).
     - For installation instructions please see: [Installing the UI5 CLI](https://github.com/SAP/ui5-tooling#installing-the-ui5-cli).