Add basic GitHub actions testing

Author: cr313

.github/workflows/pythonpackage.yml

@@ -0,0 +1,30 @@
+name: Python package
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.7, 3.8, 3.9]
+
+    steps:
+    - uses: actions/checkout@v1
+    - 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 ...
+    - name: Lint with pyfalkes
+      run: |
+        pip install pyflakes
+        pyflakes .
+    # - name: Test with pytest
+    #   run: |
+    #     pip install pytest
+    #     pytest