Started writing tests

* Tested the more important functions
* Tested the Double-Submit CSRF Middleware

tests/ServerTest.php

@@ -0,0 +1,10 @@
+<?php declare(strict_types=1);
+
+namespace Taproot\IndieAuth\Test;
+
+use PHPUnit\Framework\TestCase;
+use Taproot\IndieAuth\Server;
+
+class ServerTest extends TestCase {
+	
+}