Doxygen tutorials: basic structure

doc/tutorials/introduction/linux_gcc_cmake/linux_gcc_cmake.markdown

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+Using OpenCV with gcc and CMake {#tutorial_linux_gcc_cmake}
+===============================
+
+@note We assume that you have successfully installed OpenCV in your workstation. .. container::
+enumeratevisibleitemswithsquare
+
+-   The easiest way of using OpenCV in your code is to use [CMake](http://www.cmake.org/). A few
+    advantages (taken from the Wiki):
+    1.  No need to change anything when porting between Linux and Windows
+    2.  Can easily be combined with other tools by CMake( i.e. Qt, ITK and VTK )
+-   If you are not familiar with CMake, checkout the
+    [tutorial](http://www.cmake.org/cmake/help/cmake_tutorial.html) on its website.
+
+Steps
+-----
+
+### Create a program using OpenCV
+
+Let's use a simple program such as DisplayImage.cpp shown below.
+@code{.cpp}
+#include <stdio.h>
+#include <opencv2/opencv.hpp>
+
+using namespace cv;
+
+int main(int argc, char** argv )
+{
+    if ( argc != 2 )
+    {
+        printf("usage: DisplayImage.out <Image_Path>\n");
+        return -1;
+    }
+
+    Mat image;
+    image = imread( argv[1], 1 );
+
+    if ( !image.data )
+    {
+        printf("No image data \n");
+        return -1;
+    }
+    namedWindow("Display Image", WINDOW_AUTOSIZE );
+    imshow("Display Image", image);
+
+    waitKey(0);
+
+    return 0;
+}
+@endcode
+### Create a CMake file
+
+Now you have to create your CMakeLists.txt file. It should look like this:
+@code{.cmake}
+cmake_minimum_required(VERSION 2.8)
+project( DisplayImage )
+find_package( OpenCV REQUIRED )
+include_directories( \f${OpenCV_INCLUDE_DIRS} )
+add_executable( DisplayImage DisplayImage.cpp )
+target_link_libraries( DisplayImage \f${OpenCV_LIBS} )
+@endcode
+### Generate the executable
+
+This part is easy, just proceed as with any other project using CMake:
+@code{.bash}
+cd <DisplayImage_directory>
+cmake .
+make
+@endcode
+### Result
+
+By now you should have an executable (called DisplayImage in this case). You just have to run it
+giving an image location as an argument, i.e.:
+@code{.bash}
+./DisplayImage lena.jpg
+@endcode
+You should get a nice window as the one shown below:
+
+![image](images/GCC_CMake_Example_Tutorial.jpg)
+