Doxygen tutorials: basic structure

doc/tutorials/ios/hello/hello.markdown

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+OpenCV iOS Hello {#tutorial_hello}
+================
+
+Goal
+----
+
+In this tutorial we will learn how to:
+
+-   Link OpenCV framework with Xcode
+-   How to write simple Hello World application using OpenCV and Xcode.
+
+*Linking OpenCV iOS*
+--------------------
+
+Follow this step by step guide to link OpenCV to iOS.
+
+1.  Create a new XCode project.
+2.  Now we need to link *opencv2.framework* with Xcode. Select the project Navigator in the left
+    hand panel and click on project name.
+3.  Under the TARGETS click on Build Phases. Expand Link Binary With Libraries option.
+4.  Click on Add others and go to directory where *opencv2.framework* is located and click open
+5.  Now you can start writing your application.
+
+![image](images/linking_opencv_ios.png)
+
+*Hello OpenCV iOS Application*
+------------------------------
+
+Now we will learn how to write a simple Hello World Application in Xcode using OpenCV.
+
+-   Link your project with OpenCV as shown in previous section.
+-   Open the file named *NameOfProject-Prefix.pch* ( replace NameOfProject with name of your
+    project) and add the following lines of code.
+@code{.cpp}
+#ifdef __cplusplus
+#import <opencv2/opencv.hpp>
+#endif
+@endcode
+![image](images/header_directive.png)
+
+-   Add the following lines of code to viewDidLoad method in ViewController.m.
+@code{.cpp}
+UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Hello!" message:@"Welcome to OpenCV" delegate:self cancelButtonTitle:@"Continue" otherButtonTitles:nil];
+[alert show];
+@endcode
+![image](images/view_did_load.png)
+
+-   You are good to run the project.
+
+*Output*
+--------
+
+![image](images/output.png)
+