Added Apple ID OAuth adapter

src/Auth/OAuth/Apple.php

@@ -0,0 +1,62 @@
+<?php
+
+namespace Auth\OAuth;
+
+use Auth\OAuth;
+
+class Apple extends OAuth
+{
+    //READ THE DOCS HERE: https://developer.apple.com/documentation/signinwithapplerestapi
+
+    /**
+     * @return string
+     */
+    public function getName(): string
+    {
+        // TODO: Implement getName() method.
+    }
+
+    /**
+     * @return string
+     */
+    public function getLoginURL(): string
+    {
+        // TODO: Implement getLoginURL() method.
+    }
+
+    /**
+     * @param string $code
+     * @return string
+     */
+    public function getAccessToken(string $code): string
+    {
+        // TODO: Implement getAccessToken() method.
+    }
+
+    /**
+     * @param $accessToken
+     * @return string
+     */
+    public function getUserID(string $accessToken): string
+    {
+        // TODO: Implement getUserID() method.
+    }
+
+    /**
+     * @param $accessToken
+     * @return string
+     */
+    public function getUserEmail(string $accessToken): string
+    {
+        // TODO: Implement getUserEmail() method.
+    }
+
+    /**
+     * @param $accessToken
+     * @return string
+     */
+    public function getUserName(string $accessToken): string
+    {
+        // TODO: Implement getUserName() method.
+    }
+}