[unique] README: Add a deprecation notice

[Emmanuele Bassi <ebassi src gnome org>]

commit 68b20cb7a7d56601fa61df9351188dbab9193c8f
Author: Emmanuele Bassi <ebassi linux intel com>
Date:   Mon Apr 4 22:50:20 2011 +0100

    README: Add a deprecation notice
    
    Point to the *Application classes reference and to the migration guide.

 README |   23 ++++++++++++++++++++++-
 1 files changed, 22 insertions(+), 1 deletions(-)
---
diff --git a/README b/README
index 52f4c6a..58ec0f9 100644
--- a/README
+++ b/README
@@ -1,3 +1,24 @@
+WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
+
+LibUnique is deprecated. Do not use this library in newly-written applications.
+
+The functionality provided by this library has been incorporated in GIO and
+GTK+ 3.0.
+
+See the GApplication class reference here:
+
+  http://library.gnome.org/devel/gio/stable/GApplication.html
+
+and the GtkApplication class reference here:
+
+  http://library.gnome.org/devel/gtk3/stable/GtkApplication.html
+
+See also the porting guide available here:
+
+  http://library.gnome.org/devel/gtk3/stable/gtk-migrating-GtkApplication.html
+
+WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
+
 LibUnique is a library for writing single instance applications, that is
 applications that are run once and every further call to the same binary
 either exits immediately or sends a command to the running instance.
@@ -8,7 +29,7 @@ different IPC mechanisms depending on the platform.
 Project page: http://live.gnome.org/LibUnique
 Main repository: git://git.gnome.org/unique
 
-Copyright (C) 2007,2008,2009  Emmanuele Bassi
+Copyright (C) 2007,2008,2009,2010,2011  Emmanuele Bassi
 
 Part of the API and design is based on GUniqueApp, by Vytautas Liuolia.
 The "bacon" backend is based on BaconMessageConnection, by Bastien Nocera.