added automatic workflow

.github/workflows/deploy.yml

@@ -0,0 +1,19 @@
+name: Deploy to GitHub Pages
+'on':
+  push:
+    branches:
+      - main
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install dependencies
+        run: npm install
+      - name: Build the React app
+        run: npm run build
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: '${{ secrets.GITHUB_TOKEN }}'
+          publish_dir: ./build