feat: add Plugins module with base files for plugins architecture

modules/Plugins/BasePlugin.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Modules\Plugins;
+
+use App\Entities\Episode;
+use App\Entities\Podcast;
+use App\Libraries\SimpleRSSElement;
+
+abstract class BasePlugin implements PluginInterface
+{
+    public function __construct()
+    {
+        // load metadata from json
+        // load name, description, etc.
+    }
+
+    public function init(): void
+    {
+        // add to admin navigation
+
+        // TODO: setup navigation and views?
+    }
+
+    public function setChannelTag(Podcast $podcast, SimpleRSSElement $channel): void
+    {
+    }
+
+    public function setItemTag(Episode $episode, SimpleRSSElement $item): void
+    {
+    }
+}