added CI build test

Author: Jan Luca van den Busch

.github/workflows/python-extension-ci.yml

@@ -0,0 +1,44 @@
+name: Python Extension CI
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.8
+
+    - name: Install build dependencies
+      run: |
+        if [ "${{ matrix.os }}" == "windows-latest" ]; then
+          choco install visualstudio2019buildtools --package-parameters "--add Microsoft.VisualStudio.Component.VC.Tools.x86.x64"
+        fi
+
+    - name: Build Python extension
+      run: |
+        python setup.py build_ext --inplace
+
+    - name: Install test dependencies
+      run: |
+        python -m pip install -r requirements.txt
+
+    - name: Run tests with pytest
+      run: |
+        pytest