Run format on action (#86)

Author: ferhatelmas

.github/workflows/google-java-format.yml

@@ -0,0 +1,18 @@
+name: Format
+
+on:
+  pull_request:
+
+jobs:
+  formatting:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: '11'
+      - uses: axel-op/googlejavaformat-action@v3
+        with:
+          args: '--dry-run --set-exit-if-changed'
+          skipCommit: true
+          githubToken: ${{ secrets.GITHUB_TOKEN }}