CI, gitignore, src/ directory, black and flake8 code checkers

.github/workflows/python-app.yml

@@ -0,0 +1,30 @@
+# This workflow will install Python dependencies, run tests and lint with a single version of Python
+# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
+# Reduced subset of file from https://github.com/actions/starter-workflows/blob/main/ci/python-app.yml
+
+name: Python application
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python 3.10
+        uses: actions/setup-python@v3
+        with:
+          python-version: '3.10'
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install flake8 pytest
+          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+      - name: Check the black styling
+        run: |
+          make style-check
+      - name: Lint with flake8
+        run: |
+          # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+          make lint --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics