Add a Github action for codestyling

.github/workflows/codestyle.yml

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+# As per the example on https://help.github.com/en/actions/language-and-framework-guides/using-python-with-github-actions
+name: Python codestyling
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [2.7, 3.5, 3.6, 3.7, 3.8]
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements.txt
+    - name: Lint with flake8
+      run: |
+        pip install flake8
+        # stop the build if there are code styling problems. The GitHub editor is 127 chars wide.
+        flake8 . --count --max-line-length=127 --show-source --statistics

requirements.txt

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+six
+python-docx
+jinja2
+lxml