Update README.md

Author: dg92

README.md

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+This is the 3rd part of Image processing series on https://overflowjs.com/
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+This is the backend code, written in node.js using express framework and OpenCV. 
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+Do read the blog to know more - https://overflowjs.com/posts/Image-Processing-OpenCV-and-Nodejs-Part-3.html
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 Getting Started
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