docs: add entropy visualization demo GIF to README

Author: medeirosdev

README.md

@@ -1,5 +1,7 @@
 # TrueEntropy 🎲
 
+![Entropy Visualization Demo](assets/video.gif)
+
 [![PyPI version](https://img.shields.io/pypi/v/trueentropy.svg)](https://pypi.org/project/trueentropy/)
 [![Python 3.9+](https://img.shields.io/badge/python-3.9+-blue.svg)](https://www.python.org/downloads/)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)