File retext-add-appdata-description.patch of Package retext

Index: data/me.mitya57.ReText.appdata.xml
===================================================================
--- data/me.mitya57.ReText.appdata.xml.orig
+++ data/me.mitya57.ReText.appdata.xml
@@ -26,6 +26,11 @@
   <summary xml:lang="zh_TW">簡單高效的 Markdown 與 reStructuredText 編輯器</summary>
   <url type="homepage">https://github.com/retext-project/retext</url>
   <metadata_license>CC0</metadata_license>
+  <description>
+    <p>ReText is a text editor for plain text markup languages, such as Markdown and reStructuredText.</p>
+    <p>It supports tabs, live text preview, synchronized scrolling (for Markdown) and syntax highlighting.</p>
+    <p>ReText can export to HTML, ODT and PDF formats. It is also possible to write custom export extensions.</p>
+  </description>
   <project_license>GPL-2.0+</project_license>
   <provides>
     <binary>retext</binary>