Adds BulkStorerInterface. (#13)

Author: fmizzell

src/BulkStorerInterface.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Contracts;
+
+interface BulkStorerInterface
+{
+
+  /**
+   * Store multiple.
+   *
+   * @param array $data
+   *   An array of strings to be stored.
+   */
+    public function storeMultiple(array $data);
+}