Add an async handler for using in AJAX requests and responses.

app/src/Handler/AsyncHandler.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Slovocast\Handler;
+
+use Psr\Http\Message\ResponseInterface;
+use Slovocast\Handler\Handler;
+
+abstract class AsyncHandler extends Handler
+{
+    /**
+     * @param array<mixed> $data Data used for the response
+     */
+    public function prepareResponse(array $data, string $template = ""): ResponseInterface 
+    {
+        $acceptsHeader = $this->request->getHeader('Accept');
+
+        switch ($acceptsHeader) {
+        case 'text/html':
+            return $this->renderInline($template, $data);
+            break;
+        case 'application/json':
+        default:
+            return $this->json($data);
+            break;
+        }
+    }
+}

app/src/Handler/Channel/Episode/UploadEpisodeFileAction.php

@@ -12,6 +12,9 @@ use Slovocast\Handler\Handler;
 use Psr\Http\Message\ResponseInterface;
 use Slovocast\Domain\Repository\Episode\EpisodeFileRepositoryInterface;
 
+/**
+ * Maybe call this Async? Used for
+ */
 class UploadEpisodeFileAction extends Handler
 {
     public function __construct(