Add link to official documentation

README.md

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 # OpenAI functions
 
-The `openai-functions` Python project simplifies the usage of OpenAI's ChatGPT function calling feature. It abstracts away the complexity of parsing function signatures and docstrings by providing developers with a clean and intuitive interface.
+The `openai-functions` Python project simplifies the usage of OpenAI's ChatGPT [function calling](https://platform.openai.com/docs/guides/gpt/function-calling) feature. It abstracts away the complexity of parsing function signatures and docstrings by providing developers with a clean and intuitive interface.
 
 ![Tests](https://github.com/rizerphe/openai-functions/actions/workflows/tests.yml/badge.svg) [![Coverage Status](https://coveralls.io/repos/github/rizerphe/openai-functions/badge.svg?branch=main)](https://coveralls.io/github/rizerphe/openai-functions?branch=main) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![PyPI version](https://badge.fury.io/py/openai-functions.svg)](https://badge.fury.io/py/openai-functions) [![Documentation Status](https://readthedocs.org/projects/openai-functions/badge/?version=latest)](https://openai-functions.readthedocs.io/en/latest/?badge=latest)