Add badges for REAMDE

Author: antonmyronyuk

README.md

@@ -1,4 +1,10 @@
 # prometheus-summary
+[![tests](https://github.com/RefaceAI/prometheus-summary/workflows/tests/badge.svg)](https://github.com/RefaceAI/prometheus-summary/actions/workflows/tests.yaml)
+[![docs](https://app.readthedocs.org/projects/prometheus-summary/badge/?version=latest)](https://prometheus-summary.readthedocs.io/en/latest/)
+[![versions](https://img.shields.io/pypi/pyversions/prometheus-summary.svg)](https://github.com/RefaceAI/prometheus-summary)
+[![pypi version](https://img.shields.io/pypi/v/prometheus-summary.svg)](https://pypi.org/project/prometheus-summary/)
+[![pypi downloads](https://img.shields.io/pypi/dm/prometheus-summary)](https://pypistats.org/packages/prometheus-summary)
+
 Prometheus summary with quantiles over configurable sliding time window
 
 ## Installation