Added cs testing script to composer.json

Author: shudd3r

composer.json

@@ -29,5 +29,12 @@
         "psr-4": {
             "Polymorphine\\Message\\Tests\\": "tests/"
         }
+    },
+    "scripts": {
+        "test-cs": [
+            "vendor/bin/php-cs-fixer --dry-run -v --config=cs-fixer.php.dist --path-mode=intersection fix src tests",
+            "vendor/bin/phpcs --extensions=php --standard=vendor/polymorphine/dev/phpcs.xml src",
+            "vendor/bin/phpcs --extensions=php --standard=vendor/polymorphine/dev/phpcs.xml --ignore=*/CodeSamples/* tests"
+        ]
     }
 }