Cloned readme from README.md into appdata

Updated game description and platform information.

Author: zabidenhtf

io.github.petitlapin.Li-ri.appdata.xml

@@ -6,12 +6,12 @@
   <metadata_license>CC0-1.0</metadata_license>
   <project_license>GPL-2.0-or-later</project_license>
   <description>
-    <p>Li-Ri is a arcade game where you drive a toy wood engine in many levels and you must collect all the coaches for win. You can download it and play indefinitely.</p>
-    <p>It's Free and licensed under the GPL (General Public License). You can play on 'Windows', 'Linux', 'Mac OsX', 'Android'.</p>
+    <p>Li-Ri is an arcade game where you can drive a toy wooden train on many levels and you must collect all the wagons on map for win.</p>
+    <p>This game is free, and is available on the following platforms: 'Windows', 'Linux', 'MacOS', 'Android'.</p>
     <ul>
       <li>19 languages: Arabic, Breton, Chinese, English, Esperanto, French, German, Italian, Japanese, Korean, Portuguese, Russian, Slovak, Spanish, Swedish, Polish, Turkish, Hungarian, Dutch.</li>
       <li>50 levels in this version.</li>
-      <li>3 beautiful musics and many sound effects.</li>
+      <li>2 themes with 3 beautiful pieces of music and many sound effects.</li>
     </ul>
     <p>Li-Ri is a fork of Ri-li.</p>
   </description>