CI for building doxygen document and deploy to GitHub pages

.github/workflows/doxygen.yml

@@ -0,0 +1,21 @@
+name: Doxygen GitHub Pages Deploy Action
+
+on:
+  push:
+    branches:
+      - master
+      - doxy
+  pull_request:
+     branches: [ "master", "doxy" ]
+  workflow_dispatch:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: DenverCoder1/[email protected]
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          branch: gh-pages
+          folder: docs/html
+          config_file: Doxyfile