Added support for the CMake build system

git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/branches/sfml2@1550 4e206d99-4929-0410-ac5d-dfc041789085

doc/mainpage.hpp

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+////////////////////////////////////////////////////////////
+/// \mainpage
+///
+/// \section welcome Welcome
+/// Welcome to the official SFML documentation. Here you will find a detailed
+/// view of all the SFML <a href="./annotated.htm">classes</a>, as well as source
+/// <a href="./files.htm">files</a>. <br>
+/// If you are looking for tutorials, you can visit the official website
+/// at <a href="http://www.sfml-dev.org/tutorials/">www.sfml-dev.org</a>.
+///
+/// \section example Short example
+/// Here is a short example, to show you how simple it is to use SFML :
+///
+/// \code
+///
+/// #include <SFML/Audio.hpp>
+/// #include <SFML/Graphics.hpp>
+/// 
+/// int main()
+/// {
+///     // Create the main window
+///     sf::RenderWindow window(sf::VideoMode(800, 600), "SFML window");
+/// 
+///     // Load a sprite to display
+///     sf::Image image;
+///     if (!image.LoadFromFile("cute_image.jpg"))
+///         return EXIT_FAILURE;
+///     sf::Sprite sprite(image);
+/// 
+///     // Create a graphical text to display
+///     sf::Font font;
+///     if (!font.LoadFromFile("arial.ttf"))
+///         return EXIT_FAILURE;
+///     sf::Text text("Hello SFML", font, 50);
+/// 
+///     // Load a music to play
+///     sf::Music music;
+///     if (!music.OpenFromFile("nice_music.ogg"))
+///         return EXIT_FAILURE;
+///
+///     // Play the music
+///     music.Play();
+/// 
+///     // Start the game loop
+///     while (window.IsOpened())
+///     {
+///         // Process events
+///         sf::Event event;
+///         while (window.GetEvent(event))
+///         {
+///             // Close window : exit
+///             if (event.Type == sf::Event::Closed)
+///                 window.Close();
+///         }
+/// 
+///         // Clear screen
+///         window.Clear();
+/// 
+///         // Draw the sprite
+///         window.Draw(sprite);
+/// 
+///         // Draw the string
+///         window.Draw(text);
+/// 
+///         // Update the window
+///         window.Display();
+///     }
+/// 
+///     return EXIT_SUCCESS;
+/// }
+/// \endcode
+////////////////////////////////////////////////////////////