Update README.md

Author: NEEHITGOYAL

Python/shape-detection/README.md

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+# Description
+
+A Python Script to detect shapes,shapes area, color,centroid from images.
+
+## How to execute this Script
+
++ Run `pip install opencv-python` to install the required packages.
+*Add the image to same folder with the name img.png*
++ Run the script using `python3 Shape_Detection.py`
+the script will printout shapes area color centroid
+