chore: bootstrap module from working instance and add install guide

Module.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace humhub\modules\donations;
+
+use humhub\modules\content\components\ContentContainerActiveRecord;
+use humhub\modules\content\components\ContentContainerModule;
+use humhub\modules\space\models\Space;
+
+class Module extends ContentContainerModule
+{
+    public $resourcesPath = 'resources';
+
+    public function getContentContainerTypes()
+    {
+        return [Space::class];
+    }
+
+    public function getPermissions($contentContainer = null)
+    {
+        if ($contentContainer instanceof Space) {
+            return [
+                new permissions\ManageDonations(),
+                new permissions\Donate(),
+            ];
+        }
+
+        return [];
+    }
+
+    public function getContentContainerConfigUrl(ContentContainerActiveRecord $container)
+    {
+        if ($container->moduleManager->isEnabled('rescue_foundation')) {
+            return $container->createUrl('/rescue_foundation/settings');
+        }
+
+        return $container->createUrl('/donations/settings');
+    }
+}