add lint and test workflow

.github/workflows/lint_and_test.yml

@@ -0,0 +1,31 @@
+name: Lint and test
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.9
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.9
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install black pytest
+        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+    - name: Lint with black
+      run: |
+        # stop the build if there are Python syntax errors or undefined names
+        black --check pandas_ods_reader/
+    - name: Test with pytest
+      run: |
+        pytest tests/