docs: add doxygen comment

Author: lujiaweics

.github/workflows/main.yml

@@ -0,0 +1,30 @@
+name: Documentation
+
+on:
+  push:
+    branches: [ shared_pointer ]
+  release:
+    types: [ published ]
+
+jobs:
+  build-docs:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Setup Doxygen
+      run: |
+        sudo apt-get install -y doxygen graphviz
+
+    - name: Generate Docs
+      working-directory: ./docs
+      run: |
+        doxygen Doxyfile
+
+    - name: Deploy to GitHub Pages
+      uses: peaceiris/actions-gh-pages@v3
+      with:
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+        publish_dir: ./docs/build/html
+        keep_files: true