Update Mac OS X package readme file

cmake/apple/readme.txt

@@ -1,25 +1,25 @@
-This is Solarus, the open-source A-RPG game engine.
-
-This OSX package contains:
-- solarus-run: The executable file of the engine. Run it with the path of
-  your quest as argument (the directory containing data/ or data.solarus).
-  Without this argument, the current directory is used as quest path.
-  Try also 'solarus -help' to show information about the command-line
+This is Solarus, the open-source A-RPG game engine.
+
+Solarus is licensed under GNU General Public License v3.
+
+This OSX package contains:
+- Solarus (Solarus.app): A GUI that allows you to run a Solarus quest and
+  choose your audio and video settings.
+- Solarus-run (Solarus-run.app): An executable file that directly runs
+  a Solarus quest.
+  Run it with the path of your quest as argument
+  (the directory containing data/ or data.solarus or data.solarus.zip).
+  Without this argument, the current directory is used as quest path.
+  Try also 'solarus -help' to show information about the command-line
   options.
 - A sample quest. This is a very minimalist example of game with only one map
   and almost nothing to do, but you can run it or edit it.
-- Solarus (Solarus.app): A package you can use to distribute a quest on
-  other OSX system with non-developer environment.
-  It embed the solarus-run binary (Solarus.app/Contents/Resources/solarus-run), the
-  sample quest (Solarus.app/Contents/Resources/data) and all needed dependencies.
-  The bundle is made to run any data/ or data.solarus quest located into
-  Solarus.app/Contents/Resources.
-- Solarus Quest Editor: An editor that helps you create maps and tilesets
-  for your quest.
-  See http://www.solarus-games.org/doc/latest/ to know how to create a quest.
-
-See our website www.solarus-games.org for more information, to get help or to
-download our games or the source code of the engine.
-
-Enjoy!
-
+- Solarus Quest Editor (Solarus Quest Editor.app): An editor that helps you
+  create maps and tilesets for your quest.
+  See http://www.solarus-games.org/doc/latest/ to know how to create a quest.
+
+See our website www.solarus-games.org for more information, to get help or to
+download our games or the source code of the engine.
+
+Enjoy!
+