add workflow on PR (#44)

.github/workflows/chromatic-vrt.yml

@@ -0,0 +1,25 @@
+name: 'Chromatic VRT'
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  chromatic:
+    name: Run Chromatic
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+      - name: Install dependencies
+        run: npm ci
+      - name: Run Chromatic
+        uses: chromaui/action@latest
+        with:
+          projectToken: ${{ secrets.CHROMATIC_PROJECT_TOKEN }}