chore: create the class OAuth

src/OAuth.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace FoskyM\OAuthCenter;
+
+use OAuth2\Server;
+use OAuth2\Response;
+use OAuth2\Request;
+
+use OAuth2\GrantType\ClientCredentials;
+use OAuth2\GrantType\AuthorizationCode;
+use OAuth2\GrantType\UserCredentials;
+use OAuth2\GrantType\RefreshToken;
+class OAuth
+{
+    public function response(): Response
+    {
+        return new Response;
+    }
+    public function request(): Request
+    {
+        return new Request;
+    }
+    public function server(): Server
+    {
+        $storage = new Storage;
+        $server = new Server($storage, array(
+            'allow_implicit' => true,
+        ));
+        $server->addGrantType(new AuthorizationCode($storage));
+        $server->addGrantType(new ClientCredentials($storage));
+        $server->addGrantType(new UserCredentials($storage));
+        $server->addGrantType(new RefreshToken($storage));
+        return $server;
+    }
+}

src/Storage.php

@@ -14,7 +14,7 @@ use OAuth2\Storage\RefreshTokenInterface;
 use OAuth2\Storage\ScopeInterface;
 use OAuth2\Storage\UserCredentialsInterface;
 
-abstract class Storage implements
+class Storage implements
     AuthorizationCodeInterface,
     AccessTokenInterface,
     ClientCredentialsInterface,