ADD: GitHub CI

.github/workflows/ci.yml

@@ -0,0 +1,21 @@
+name: Python linting
+on: [push, pull_request]
+jobs:
+  check_linting:
+    name: Check Python linting
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+      - name: Display Python version
+        run: python --version
+      - name: Install linting package
+        run: |
+          python -m pip install --upgrade pip
+          pip install flake8
+      - name: Run linting
+        run: flake8 --count --show-source --statistics --max-line-length=120