Update README.md

Author: vikasgupta-github

README.md

@@ -13,6 +13,7 @@ Want to become an expert in AI? [AI Courses by OpenCV](https://opencv.org/course
 
 | Blog Post | |
 | ------------- |:-------------|
+|[Understanding Lens Distortion](https://www.learnopencv.com/understanding-lens-distortion/)|[Code](https://github.com/spmallick/learnopencv/tree/master/UnderstandingLensDistortion)|
 |[Image Matting with state-of-the-art Method “F, B, Alpha Matting”](https://www.learnopencv.com/image-matting-with-state-of-the-art-method-f-b-alpha-matting/)|[Code](https://github.com/spmallick/learnopencv/tree/master/FBAMatting) |
 |[Bag Of Tricks For Image Classification - Let's check if it is working or not](https://www.learnopencv.com/bag-of-tricks-for-image-classification-lets-check-if-it-is-working-or-not/)| [Code](https://github.com/spmallick/learnopencv/tree/master/Bag-Of-Tricks-For-Image-Classification)
 |[Getting Started with OpenCV CUDA Module](https://www.learnopencv.com/getting-started-opencv-cuda-module/)|[Code](https://github.com/spmallick/learnopencv/tree/master/Getting-Started-OpenCV-CUDA-Module)|