Add more fields to the AppStream metainfo file

Author: mavit

build/linux/dist/appdata.xml

@@ -3,6 +3,7 @@
 <component type="desktop-application">
   <id>cc.arduino.arduinoide.desktop</id>
   <metadata_license>CC-BY-SA-3.0</metadata_license>
+  <developer_name>Arduino LLC</developer_name>
 
   <name>Arduino IDE</name>
   <summary>Open-source electronics prototyping platform</summary>
@@ -21,11 +22,21 @@
   </description>
 
   <screenshots>
-    <screenshot type="default" width="624" height="351">http://mavit.fedorapeople.org/appdata/arduino-screenshot.png</screenshot>
-    <screenshot width="704" height="396">http://mavit.fedorapeople.org/appdata/arduino-photo.jpg</screenshot>
+    <screenshot type="default">
+      <image>https://mavit.fedorapeople.org/appdata/arduino-screenshot.png</image>
+      <caption>The Arduino IDE showing a simple example program</caption>
+    </screenshot>
+    <screenshot>
+      <image>https://mavit.fedorapeople.org/appdata/arduino-photo.jpg</image>
+      <caption>Arduino hardware being connected to a breadboard</caption>
+    </screenshot>
   </screenshots>
 
   <url type="homepage">http://www.arduino.cc/</url>
+  <url type="help">https://www.arduino.cc/en/Guide/HomePage</url>
+  <url type="bugtracker">https://github.com/arduino/Arduino/issues</url>
+  <url type="translate">https://github.com/arduino/Arduino/tree/master/arduino-core/src/processing/app/i18n</url>
+  <url type="donation">https://www.arduino.cc/en/Main/Contribute</url>
 
   <update_contact>arduino.appdata.xml@mavit.org.uk</update_contact>
 </component>