GitHub action to run formatting (#53)

.github/workflows/ci.yml

@@ -0,0 +1,35 @@
+name: Code Formatting Check
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  format-check:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.x'
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install black isort
+
+    - name: Run isort
+      run: |
+        isort .
+
+    - name: Run black
+      run: |
+        black --line-length=120 .