Added vendor/ directory for Composer's installed files

vendor/alexgarrett/violin/src/Contracts/MessageBagContract.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace Violin\Contracts;
+
+interface MessageBagContract
+{
+    public function has($key);
+    public function first($key);
+    public function get($key);
+    public function all();
+    public function keys();
+}