establishing CI workflow

.github/workflows/ci.yml

@@ -0,0 +1,35 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  tests:
+    name: build
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.11"
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+          pip install flake8 mypy pytest coverage
+
+      - name: Lint with flake8
+        run: flake8 .
+
+      - name: Type check with mypy
+        run: mypy --strict .
+
+      - name: Run tests with pytest
+        run: pytest --cov=.