env and vendor added temporary

vendor/laravel/socialite/src/Contracts/Provider.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Laravel\Socialite\Contracts;
+
+interface Provider
+{
+    /**
+     * Redirect the user to the authentication page for the provider.
+     *
+     * @return \Symfony\Component\HttpFoundation\RedirectResponse|\Illuminate\Http\RedirectResponse
+     */
+    public function redirect();
+
+    /**
+     * Get the User instance for the authenticated user.
+     *
+     * @return \Laravel\Socialite\Contracts\User
+     */
+    public function user();
+}