Add appdata file for KReversi in master branch + use reverse dns naming scheme for the desktop file

Differential Revision: https://phabricator.kde.org/D5386

CMakeLists.txt

@@ -49,7 +49,8 @@ install(TARGETS kreversi  ${INSTALL_TARGETS_DEFAULT_ARGS} )
 
 ########### install files ###############
 
-install( PROGRAMS kreversi.desktop  DESTINATION  ${XDG_APPS_INSTALL_DIR} )
+install( PROGRAMS org.kde.kreversi.desktop  DESTINATION  ${XDG_APPS_INSTALL_DIR} )
 #install( FILES kreversi.kcfg  DESTINATION  ${KCFG_INSTALL_DIR} )
 install( FILES kreversiui.rc  DESTINATION  ${DATA_INSTALL_DIR}/kreversi )
 install( DIRECTORY qml DESTINATION ${DATA_INSTALL_DIR}/kreversi )
+install(FILES org.kde.kreversi.appdata.xml DESTINATION ${SHARE_INSTALL_PREFIX}/metainfo/ )

org.kde.kreversi.appdata.xml

+<?xml version="1.0" encoding="utf-8"?>
+<component type="desktop-application">
+  <id>org.kde.kreversi.desktop</id>
+  <metadata_license>FSFAP</metadata_license>
+  <project_license>GPL-2.0+</project_license>
+  <name>KReversi</name>
+  <summary>Reversi Board Game</summary>
+    <description>
+    <p>
+      KReversi is a simple one player strategy game played against the computer.
+      If a player's piece is captured by an opposing player, that piece is turned over
+      to reveal the color of that player. A winner is declared when one player has more
+      pieces of his own color on the board and there are no more possible moves.
+    </p>
+  </description>
+  <url type="bugtracker">https://bugs.kde.org/enter_bug.cgi?format=guided&amp;product=kreversi</url>
+  <url type="help">http://docs.kde.org/?application=kreversi</url>
+  <screenshots>
+    <screenshot type="default">
+      <image>https://kde.org/images/screenshots/kreversi.png</image>
+    </screenshot>
+  </screenshots>
+  <project_group>KDE</project_group>
+  <provides>
+    <binary>kreversi</binary>
+  </provides>
+</component>