feat: Add style check workflow to PRs

Author: haroldadmin

.github/workflows/style-check.yml

@@ -0,0 +1,17 @@
+name: Code-style checks
+
+on: [pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+
+      - name: Ktlint check
+        run: ./gradlew ktlint