Add AppData and Desktop files

gns3-gui.appdata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Copyright 2016 Athmane Madjoudj <athmane@fedoraproject.org> -->
+<!--
+EmailAddress: athmane@fedoraproject.org
+SentUpstream: 2016-08-02
+-->
+<application>
+  <id type="desktop">gns3-gui.desktop</id>
+  <metadata_license>GPLv3</metadata_license>
+  <project_license>GPLv3</project_license>
+  <description>
+    <p>
+     GNS3 is a graphical network simulator that allows you to design complex network
+     topologies. You may run simulations or configure devices ranging from simple
+     workstations to powerful routers.
+    </p>
+  </description>
+  <url type="homepage">http://www.gns3.com/</url>
+</application>

gns3-gui.desktop

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+[Desktop Entry]
+Name=GNS3
+GenericName=Graphical Network Simulator 3
+Comment=Graphical Network Simulator 3
+Exec=gns3
+Icon=gns3
+Terminal=false
+Type=Application
+Categories=Application;Network;Qt;