chore: Add docs badge

README.md

@@ -4,6 +4,7 @@
 [![ksef-utils Test](https://github.com/pprzetacznik/ksef-utils/actions/workflows/test.yml/badge.svg)](https://github.com/pprzetacznik/ksef-utils/actions/workflows/test.yml)
 [![PyPI version](https://badge.fury.io/py/ksef-utils.svg)](https://pypi.org/project/ksef-utils/)
 [![PyPI - Python Version](https://img.shields.io/pypi/pyversions/ksef-utils)](https://pypi.org/project/ksef-utils/)
+[![Documentation Status](https://readthedocs.org/projects/ksef-utils/badge/?version=latest)](https://ksef-utils.readthedocs.io/en/latest/?badge=latest)
 
 This project contains utilities and example requests that can be helpful when integrating with Polish central invoicing system called [Krajowy System e-Faktur (KSeF)](https://www.podatki.gov.pl/ksef/).
 

docs/index.rst

@@ -10,6 +10,9 @@ Welcome to KSeF-utils's documentation!
    :maxdepth: 2
    :caption: Contents:
 
+.. image:: https://readthedocs.org/projects/ksef-utils/badge/?version=latest
+    :target: https://ksef-utils.readthedocs.io/en/latest/?badge=latest
+    :alt: Documentation Status
 
 
 Indices and tables