Add own rss widget

Classes/Dashboard/Widgets/OwnRssFeed.php

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+<?php
+
+namespace DanielSiepmann\DsSite\Dashboard\Widgets;
+
+/*
+ * Copyright (C) 2020 Daniel Siepmann <coding@daniel-siepmann.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+use TYPO3\CMS\Dashboard\Widgets\AbstractRssWidget;
+
+class OwnRssFeed extends AbstractRssWidget
+{
+    protected $rssFile = 'https://daniel-siepmann.de/feed/rssFeedAllBlogPosts/sitemap.xml';
+    protected $lifeTime = 43200;
+    protected $title = 'Own RSS Feed';
+    protected $description = 'RSS Feed of Blog Posts';
+    protected $iconIdentifier = 'content-widget-rss';
+    protected $moreItemsLink = 'https://daniel-siepmann.de/';
+    protected $moreItemsText = 'Open Blog';
+}

Configuration/Backend/DashboardWidgetGroups.php

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+<?php
+return [
+    'own' => [
+        'title' => 'Own widgets',
+    ],
+];

Configuration/Services.yaml

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+services:
+  _defaults:
+    autowire: true
+    autoconfigure: true
+    public: false
+
+  DanielSiepmann\DsSite\:
+    resource: '../Classes/*'
+
+  DanielSiepmann\DsSite\Dashboard\Widgets\OwnRssFeed:
+    class: DanielSiepmann\DsSite\Dashboard\Widgets\OwnRssFeed
+    arguments: ['ownRss']
+    tags:
+      - name: dashboard.widget
+        identifier: ownRss
+        widgetGroups: 'own'