about window: show data from appdata file

data/resources/com.ranfdev.Notify.metainfo.xml.in.in

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+<?xml version="1.0" encoding="UTF-8"?>
+<!-- ranfdev 2019 <ranfdev@gmail.com> -->
+<component type="desktop-application">
+  <id>@app-id@</id>
+  <metadata_license>CC0</metadata_license>
+  <!-- Insert your license of choice here -->
+  <project_license>GPL-3.0-or-later</project_license>
+  <name>Notify</name>
+  <summary>Receive notifications from ntfy.sh.</summary>
+  <description>
+    <p>Versatile GTK4 client designed to seamlessly interface with the ntfy.sh notification service</p>
+  </description>
+  <screenshots>
+    <screenshot type="default">
+      <image>https://raw.githubusercontent.com/ranfdev/Notify/main/data/screenshots/1.png</image>
+      <caption>Main window, welcome screen</caption>
+    </screenshot>
+    <screenshot>
+      <image>https://raw.githubusercontent.com/ranfdev/Notify/main/data/screenshots/2.png</image>
+      <caption>Main window, subscription view</caption>
+    </screenshot>
+  </screenshots>
+  <url type="homepage">https://github.com/ranfdev/Notify</url>
+  <url type="bugtracker">https://github.com/ranfdev/Notify/issues</url>
+  <url type="donation">https://github.com/sponsors/ranfdev</url>
+
+  <content_rating type="oars-1.0" />
+  <releases>
+    <release version="0.1.2" date="2023-11-07">
+      <ul>
+        <li>Introduced dialog to write advanced messages</li>
+        <li>Automatic download of attached images</li>
+        <li>Introduced support for action buttons in the notifications</li>
+        <li>Improved performance of the message list layout</li>
+        <li>Improved design for status chips</li>
+        <li>Improved design for the message bar</li>
+        <li>Various bug fixes</li>
+      </ul>
+    </release>
+    <release version="0.1.1" date="2023-10-24" />
+    <release version="0.1.0" date="2023-10-13" />
+  </releases>
+  <developer_name>ranfdev</developer_name>
+  <update_contact>ranfdev@gmail.com</update_contact>
+  <translation type="gettext">@gettext-package@</translation>
+  <launchable type="desktop-id">@app-id@.desktop</launchable>
+</component>