adding workflow

.github/workflows/main.yml

@@ -0,0 +1,26 @@
+name: Publish Example
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dart-lang/setup-dart@v1
+
+      - run: dart pub get
+      - run: dart test
+      - run: cd example && dart pub get
+      - run: dart pub global activate webdev
+      - run: cd example && webdev build
+
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+            github_token: ${{ secrets.GITHUB_TOKEN }}
+            publish_dir: ./example/build/web