Add initial CI workflow

Author: ubruhin

.github/workflows/main.yml

@@ -0,0 +1,17 @@
+name: CI
+on: [push, pull_request]
+jobs:
+  tests:
+    name: Check
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: "3.11"
+      - name: Install dependencies
+        run: pip install -r requirements-dev.txt
+      - name: Run flake8
+        run: flake8
+      - name: Run isort
+        run: isort --check --diff .

requirements-dev.txt

@@ -0,0 +1,2 @@
+flake8~=7.0
+isort~=5.13