Add Composer scripts to execute code style check & fix through PHPCS

Author: ravage84

composer.json

@@ -9,5 +9,9 @@
         "squizlabs/php_codesniffer": "^3.5"
     },
     "license": "MIT",
-    "minimum-stability": "stable"
+    "minimum-stability": "stable",
+    "scripts": {
+        "cs-check": "phpcs -p --runtime-set ignore_errors_on_exit 1 --runtime-set ignore_warnings_on_exit 1",
+        "cs-fix": "phpcbf -p --runtime-set ignore_errors_on_exit 1 --runtime-set ignore_warnings_on_exit 1"
+    }
 }