Huge number of updates, too tired to list them all

+ Added a bunch of API handler classes that will use the already created models
+ Created a new Client class that will connect to new API handler classes
+ Created new collection classes

src/Model/TeamPermission.php

@@ -0,0 +1,24 @@
+<?php declare(strict_types=1);
+namespace Gitea\Models;
+
+use Enum\{EnumTrait};
+
+/** Defines the permission of a team. */
+final class TeamPermission {
+  use EnumTrait;
+
+  /** @var string The team has the administrator permission. */
+  const admin = 'admin';
+
+  /** @var string The team doesn't have any permission. */
+  const none = 'none';
+
+  /** @var string The team has the owner permission. */
+  const owner = 'owner';
+
+  /** @var string The team has the read permission. */
+  const read = 'read';
+
+  /** @var string The team has the write permission. */
+  const write = 'write';
+}