Added vendor/ directory for Composer's installed files

vendor/alexgarrett/violin/src/Rules/CheckedRule.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Violin\Rules;
+
+use Violin\Contracts\RuleContract;
+
+class CheckedRule implements RuleContract
+{
+    public function run($value, $input, $args)
+    {
+        return in_array($value, ['yes', 'on', '1', 1, true, 'true'], true);
+    }
+
+    public function error()
+    {
+        return 'You need to check the {field} field.';
+    }
+
+    public function canSkip()
+    {
+        return true;
+    }
+}