Add github actions for precommit and tests

.github/workflows

@@ -0,0 +1,25 @@
+name: Python package
+
+on: [push]
+
+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 -r requirements.txt
+	  pip install -r requirements_dev.txt
+      - name: Run precommit
+        run: |
+          pre-commit run --all-files
+      - name: Test with unittest
+        run: |
+	  python -m unittest tests/*.py