Add workflows.

.github/workflows/autotest.yml

@@ -59,3 +59,20 @@ jobs:
           python setup.py install
           pip uninstall comtypes -y
           python test_pip_install.py
+
+  docs-source-doctest:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+          architecture: x64
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r docs/requirements.txt
+      - name: Run doctest
+        run: sphinx-build -b doctest -d docs/build/doctrees docs/source docs/build/doctest
+        working-directory: ./