Create framework for Application Kit.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21851 a95241bf-73f2-0310-859d-f6bbb57e9c96

docs/user/app/_app_intro.dox

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+/*
+ * Copyright 2007, Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Documentation by:
+ *		Niels Sascha Reedijk <[email protected]>
+ */
+
+
+/*!
+	\page app_intro Introduction to the Application Kit.
+  
+	The Application Kit is a kit you will have to get to know in case you
+	want to effectively write Haiku applications with a GUI. The application
+	kit does exactly as the name might inform you: it is the basis for Haiku
+	applications. It is advised to read through this document, and the
+	documents referenced before going to any other part of the API. 
+  
+	We can divide the classes in the application kit up in two categories. The
+	biggest part of the classes are in the 'messaging' classes. The following
+	are part of it:
+	- BHandler
+	- BInvoker
+	- BLooper
+	- BMessage
+	- BMessageFilter
+	- BMessageQueue
+	- BMessageRUnner
+	- BMessenger
+  
+	The second category is the 'system interaction'  category. These classes
+	provides hooks for you application to interact with the rest of the system.
+	The most important class is BApplication. This is a list of all the
+	classes:
+	- BApplication
+	- BClipboard
+	- BCursor
+	- BPropertyInfo
+	- BRoster
+*/