appdata: add a release description

data/org.freedesktop.dabrain34.GstPipelineStudio.appdata.xml.in.in

@@ -27,7 +27,14 @@
   <translation type="gettext">@gettext-package@</translation>
   <launchable type="desktop-id">@app-id@.desktop</launchable>
     <releases>
-    <release version="@version@" date="@current_date@"/>
+    <release version="@version@" date="@current_date@">
+    <description>
+        <p>Welcome to GstPipelineStudio</p>
+        <ul>
+          <li>Support a new websocket service</li>
+        </ul>
+      </description>
+    </release>
   </releases>
   <content_rating type="oars-1.1">
     <content_attribute id="violence-cartoon">none</content_attribute>

release.md

@@ -6,6 +6,7 @@
   - VERSION
   - index.html
   - And rebuild to regenerate the cargo.lock
+  - update the changelog in org.freedesktop.dabrain34.GstPipelineStudio.appdata.xml.in.in within release/description
 
 - create a tag on gitlab
 - Fetch the package from the `linux release` job or you can make it manually with: