Added sample code for tutorial - cpp

samples/cpp/tutorial_code/Basic/DisplayImage.cpp

@@ -0,0 +1,28 @@
+/**
+ * @file DisplayImage.cpp
+ * @brief Sample code that show how to read and display an image in a OpenCV window
+ * @author OpenCV team
+ */
+#include <cv.h>
+#include <highgui.h>
+
+using namespace cv;
+
+int main( int argc, char** argv )
+{
+   Mat image;
+   image = imread( argv[1], 1 );
+
+   if( argc != 2 || !image.data )
+     { 
+       printf( "No image data \n" );
+       return -1; 
+     }
+
+   namedWindow( "Display Image", CV_WINDOW_AUTOSIZE );
+   imshow( "Display Image", image );
+
+   waitKey(0);
+
+   return 0;
+}