apps: add opencv_version command line tool

apps/version/opencv_version.cpp

@@ -0,0 +1,28 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html.
+
+#include <iostream>
+
+#include <opencv2/core.hpp>
+
+int main(int argc, const char** argv)
+{
+    cv::CommandLineParser parser(argc, argv,
+        "{ help h usage ? |      | show this help message }"
+        "{ verbose v      |      | show build configuration log }"
+    );
+    if (parser.has("help"))
+    {
+        parser.printMessage();
+    }
+    else if (parser.has("verbose"))
+    {
+        std::cout << cv::getBuildInformation().c_str() << std::endl;
+    }
+    else
+    {
+        std::cout << CV_VERSION << std::endl;
+    }
+    return 0;
+}