Merge pull request #50 from deepset-ai/badge

Add tests badge on README

Author: mpangrazzi

README.md

@@ -3,6 +3,7 @@
 [![PyPI - Version](https://img.shields.io/pypi/v/hayhooks.svg)](https://pypi.org/project/hayhooks)
 [![PyPI - Python Version](https://img.shields.io/pypi/pyversions/hayhooks.svg)](https://pypi.org/project/hayhooks)
 [![Docker image release](https://github.com/deepset-ai/hayhooks/actions/workflows/docker.yml/badge.svg)](https://github.com/deepset-ai/hayhooks/actions/workflows/docker.yml)
+[![Tests](https://github.com/deepset-ai/hayhooks/actions/workflows/tests.yml/badge.svg)](https://github.com/deepset-ai/hayhooks/actions/workflows/tests.yml)
 -----
 
 **Table of Contents**