Update README.md

Author: lukas-blecher

README.md

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 # pix2tex - LaTeX OCR
 
-[![GitHub](https://img.shields.io/github/license/lukas-blecher/LaTeX-OCR)](https://github.com/lukas-blecher/LaTeX-OCR) [![PyPI](https://img.shields.io/pypi/v/pix2tex?logo=pypi)](https://pypi.org/project/pix2tex) [![PyPI - Downloads](https://img.shields.io/pypi/dm/pix2tex?logo=pypi)](https://pypi.org/project/pix2tex) [![GitHub all releases](https://img.shields.io/github/downloads/lukas-blecher/LaTeX-OCR/total?color=blue&logo=github)](https://github.com/lukas-blecher/LaTeX-OCR/releases) [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/lukas-blecher/LaTeX-OCR/blob/main/notebooks/LaTeX_OCR_test.ipynb) 
+[![GitHub](https://img.shields.io/github/license/lukas-blecher/LaTeX-OCR)](https://github.com/lukas-blecher/LaTeX-OCR) [![Documentation Status](https://readthedocs.org/projects/pix2tex/badge/?version=latest)](https://pix2tex.readthedocs.io/en/latest/?badge=latest) [![PyPI](https://img.shields.io/pypi/v/pix2tex?logo=pypi)](https://pypi.org/project/pix2tex) [![PyPI - Downloads](https://img.shields.io/pypi/dm/pix2tex?logo=pypi)](https://pypi.org/project/pix2tex) [![GitHub all releases](https://img.shields.io/github/downloads/lukas-blecher/LaTeX-OCR/total?color=blue&logo=github)](https://github.com/lukas-blecher/LaTeX-OCR/releases) [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/lukas-blecher/LaTeX-OCR/blob/main/notebooks/LaTeX_OCR_test.ipynb) 
 
 The goal of this project is to create a learning based system that takes an image of a math formula and returns corresponding LaTeX code.