Add an example AppData file so that Cura is visible in Linux software centers

Fixes: https://github.com/Ultimaker/Cura/issues/530

CMakeLists.txt

@@ -43,6 +43,8 @@ if(NOT APPLE AND NOT WIN32)
             DESTINATION lib/python${PYTHON_VERSION_MAJOR}/dist-packages/cura)
     install(FILES ${CMAKE_BINARY_DIR}/cura.desktop
             DESTINATION ${CMAKE_INSTALL_DATADIR}/applications)
+    install(FILES ${CMAKE_BINARY_DIR}/cura.appdata.xml
+            DESTINATION ${CMAKE_INSTALL_DATADIR}/appdata)
     install(FILES cura.sharedmimeinfo
             DESTINATION ${CMAKE_INSTALL_DATADIR}/mime/packages/
             RENAME cura.xml )

cura.appdata.xml

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Copyright 2016 Richard Hughes <richard@hughsie.com> -->
+<component type="desktop">
+  <id>cura.desktop</id>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>AGPL-3.0 and CC-BY-SA-4.0</project_license>
+  <name>Cura</name>
+  <summary>The world's most advanced 3d printer software</summary>
+  <description>
+    <p>
+      Cura creates a seamless integration between hardware, software and
+      materials for the best 3D printing experience around.
+      Cura supports the 3MF, OBJ and STL file formats and is available on
+      Windows, Mac and Linux.
+    </p>
+    <ul>
+      <li>Novices can start printing right away</li>
+      <li>Experts are able to customize 200 settings to achieve the best results</li>
+      <li>Optimized profiles for Ultimaker materials</li>
+      <li>Supported by a global network of Ultimaker certified service partners</li>
+      <li>Print multiple objects at once with different settings for each object</li>
+      <li>Cura supports STL, 3MF and OBJ file formats</li>
+      <li>Open source and completely free</li>
+    </ul>
+  </description>
+  <screenshots>
+    <screenshot type="default" width="1280" height="720">http://software.ultimaker.com/Cura.png</screenshot>
+  </screenshots>
+  <url type="homepage">https://ultimaker.com/en/products/cura-software</url>
+  <translation type="gettext">Cura</translation>
+</component>