added php-style github action

.github/workflows/php-style.yml

@@ -0,0 +1,20 @@
+name: PHP Style
+
+on: [push, pull_request]
+
+jobs:
+    php-cs-fixer:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v2
+              with:
+                  ref: ${{ github.head_ref }}
+
+            - name: PHP-CS-Fixer
+              uses: docker://oskarstark/php-cs-fixer-ga:2.19.0
+              with:
+                args: --config=.php_cs.dist --allow-risky yes
+
+            - uses: stefanzweifel/git-auto-commit-action@v4
+              with:
+                  commit_message: Apply php-cs-fixer changes