Add AppStream metadata

This will ensure KiCad will be easily installable from the app stores such
as GNOME Software.

The screenshots probably need a better home. Not that it would matter
too much -- the Linux distributions do cache them with their feeds, so
the app store applications don't access them from this source directly.

Screenshots from the web [1] can't be used since they are too large for
use in the app store application. :(

[1] http://kicad-pcb.org/discover/screenshots/

Fixes lp:1323789

https://bugs.launchpad.net/kicad/+bug/1323789

CMakeLists.txt

@@ -795,6 +795,7 @@ if( UNIX AND NOT APPLE )
     set( UNIX_MIME_FILES ${UNIX_MIME_DIR}/mime )
     set( UNIX_ICON_FILES ${UNIX_MIME_DIR}/icons )
     set( UNIX_APPLICATIONS_FILES ${UNIX_MIME_DIR}/applications )
+    set( UNIX_APPDATA_FILES resources/linux/appdata )
 
     # Install Mime directory
     install( DIRECTORY ${UNIX_ICON_FILES}
@@ -813,6 +814,12 @@ if( UNIX AND NOT APPLE )
         DESTINATION ${CMAKE_INSTALL_PREFIX}/share
         COMPONENT resources
         )
+
+    # Install AppStream directory (app store entry)
+    install( DIRECTORY ${UNIX_APPDATA_FILES}
+        DESTINATION ${CMAKE_INSTALL_PREFIX}/share
+        COMPONENT resources
+        )
 endif()
 
 #include( CTest )

resources/linux/appdata/kicad.appdata.xml

@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Copyright (C) 2016-2017 Lubomir Rintel <lkundrak@v3.sk> -->
+<!-- Copyright (C) 2016-2017 KiCad Developers, see AUTHORS.txt for contributors. -->
+<component type="desktop">
+  <id>kicad.desktop</id>
+  <name>KiCad</name>
+  <project_license>GPL-2.0+</project_license>
+  <metadata_license>CC0-1.0</metadata_license>
+  <summary>EDA Suite</summary>
+
+  <keywords>
+    <keyword>KiCad</keyword>
+    <keyword>EDA</keyword>
+    <keyword>PCB</keyword>
+    <keyword>Schema</keyword>
+    <keyword>PcbNew</keyword>
+    <keyword>Eeschema</keyword>
+  </keywords>
+
+  <description>
+    <p>A Cross Platform and Open Source Electronics Design Automation Suite.</p>
+    <p>The programs handle Schematic Capture, and PCB Layout with Gerber output.</p>
+  </description>
+
+  <screenshots>
+    <screenshot type="default">
+      <image width="1024" height="576">http://kicad-pcb.org/img/screenshots/appstream/kicad.png</image>
+    </screenshot>
+
+    <screenshot>
+      <caption>Eeschema Schematic Editor</caption>
+      <image width="1024" height="576">http://kicad-pcb.org/img/screenshots/appstream/eeschema.png</image>
+    </screenshot>
+
+    <screenshot>
+      <caption>PcbNew PCB Layout</caption>
+      <image width="1024" height="576">http://kicad-pcb.org/img/screenshots/appstream/pcbnew.png</image>
+    </screenshot>
+
+    <screenshot>
+      <caption>PcbNew 3D Viewer</caption>
+      <image width="1024" height="576">http://kicad-pcb.org/img/screenshots/appstream/3dviewer.png</image>
+    </screenshot>
+  </screenshots>
+
+  <url type="homepage">http://kicad-pcb.org/</url>
+  <url type="bugtracker">http://kicad-pcb.org/help/report-a-bug/</url>
+  <update_contact>kicad-developers@lists.launchpad.net</update_contact>
+  <developer_name>The KiCad Developers</developer_name>
+</component>