Add check style notification

Author: marki1an

.github/workflows/check-style.yml

@@ -0,0 +1,17 @@
+name: check-style.yml
+on: pull_request
+
+jobs:
+  checkstyle_job:
+    runs-on: ubuntu-latest
+    name: Checkstyle job
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Run check style
+        uses: nikitasavinov/checkstyle-action@master
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          reporter: 'github-pr-check'
+          tool_name: 'testtool'
+          checkstyle_config: checkstyle.xml