added workflow

.github/workflows/deploy.yml

@@ -0,0 +1,26 @@
+name: Build Documentation and Deploy
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build-and-deploy:
+    concurrency: ci-${{ github.ref }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Build
+        run: |
+
+        mkdir _build
+        cmake -B ./_build .
+        cmake --build "_build" --target ALL
+
+      - name: Deploy
+        uses: JamesIves/github-pages-deploy-action@v4
+        with:
+          folder: build/doc/sphinx
+