Added license information to sample

Nerdyvedi · web-flow · commit 0a7ca9e2d718 · 2019-09-08T17:08:20.000+05:30
diff --git a/modules/ximgproc/samples/globalmatting.cpp b/modules/ximgproc/samples/globalmatting.cpp
@@ -1,3 +1,6 @@
+// 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 <opencv2/ximgproc.hpp>
 #include <iostream>
 #include <opencv2/core.hpp>
