Update README.md

Author: mmtaksuu

README.md

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 # OpenCV Python Tutorial
-Hello and Welcome to my opencv python tutorial. This page is designed for the people who want to improve computer vision and image processing skills. On this tutorial, I shared some codes at the above and their description as given below. 
+Hello and Welcome to my opencv python tutorial. This page is designed for the people who want to improve computer vision and image processing skills. On this tutorial, I shared some codes at the above and their descriptions as given below. 
+
+Before getting started I want to share with you a link that indicates a book called OpenCV Computer Vision Projects with Python. 
+Link for this book : https://www.pdfdrive.com/opencv-computer-vision-projects-with-python-d58213131.html
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