Add user and user provider contracts

Author: Jaspaul

src/Contracts/User.php

@@ -0,0 +1,9 @@
+<?php
+
+namespace Jaspaul\LaravelRollout\Contracts;
+
+use Opensoft\Rollout\RolloutUserInterface;
+
+interface User extends RolloutUserInterface
+{
+}

src/Contracts/UserProvider.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Jaspaul\LaravelRollout\Contracts;
+
+interface UserProvider
+{
+    /**
+     * Finds and returns rollout users.
+     *
+     * @param mixed $id
+     *        A unique identifier for the rollout user in the system.
+     *
+     * @return \Jaspaul\LaravelRollout\Contracts\User
+     *         A rollout user.
+     */
+    public function findByRolloutIdentifier($id);
+}