Create pep8_check.yml

.github/workflows/pep8_check.yml

@@ -0,0 +1,25 @@
+name: PEP8 Code Style Check
+
+on: [push, pull_request]
+
+jobs:
+  flake8:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        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 flake8
+
+      - name: Run flake8
+        run: |
+          flake8 .