Update README.md

Author: abidrahmank

README.md

@@ -3,14 +3,22 @@ OpenCV2-Python-Guide
 
 This repo contains tutorials on OpenCV-Python library using new cv2 interface
 
+** IMP - This tutorial is meant for OpenCV 3x version. Not OpenCV 2x **
+** IMP - This tutorial is meant for OpenCV 3x version. Not OpenCV 2x **
+** IMP - This tutorial is meant for OpenCV 3x version. Not OpenCV 2x **
+** IMP - This tutorial is meant for OpenCV 3x version. Not OpenCV 2x **
+** IMP - This tutorial is meant for OpenCV 3x version. Not OpenCV 2x **
+
 Contents
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 * source : contains the original source of docs in markup language
 * build  : contains ready-to-use documentation in html format
 
 Online
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-An online version of this tutorials can be found at https://opencv-python-tutroals.readthedocs.org/en/latest/index.html
+
+* For official tutorials, please visit : http://docs.opencv.org/trunk/doc/py_tutorials/py_tutorials.html
+* https://opencv-python-tutroals.readthedocs.org/en/latest/index.html - This is only for checking. May contain lots of errors, please stick to the official tutorials.
 
 Offline
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