Add deployment workflow

.github/workflows/deploy.yml

@@ -0,0 +1,23 @@
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches:
+      - master
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: Build
+      run: |
+        npm ci
+        npm RUN build
+
+    - name: Deploy
+      uses: JamesIves/github-pages-deploy-action@releases/v3
+      with:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        BRANCH: gh-pages
+        FOLDER: BUILD