Add documentation badge and link to README.md

README.md

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+[![Documentation Status](https://readthedocs.org/projects/stockdex/badge/?version=latest)](https://ahnazary.github.io/stockdex/)
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 [![Publish Python Package to PyPI](https://github.com/ahnazary/stockdex/actions/workflows/publish-package.yaml/badge.svg)](https://github.com/ahnazary/stockdex/actions/workflows/publish-package.yaml)
 [![PyPI version](https://badge.fury.io/py/stockdex.svg)](https://badge.fury.io/py/stockdex)
 ![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)
 ![Code style: isort](https://img.shields.io/badge/%20imports-isort-%231674b1?style=flat&labelColor=ef8336)
 
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 # Stockdex
 
 Stockdex is a Python package that provides a simple interface to access financial data from Yahoo Finance. Data is returned as a pandas DataFrame.
 
+Check out sphinx documentation [here](https://ahnazary.github.io/stockdex/) for more information about the package.
+
 # Installation 
 
 Install the package using pip: