README: add badges

Author: csernazs

README.md

@@ -3,6 +3,8 @@
 [![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT)
 [![codecov](https://codecov.io/gh/csernazs/pytest-httpserver/branch/master/graph/badge.svg?token=MX2JXbHqRH)](https://codecov.io/gh/csernazs/pytest-httpserver)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
+[![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json)](https://github.com/astral-sh/ruff)
+[![Downloads](https://static.pepy.tech/badge/pytest-httpserver/month)](https://pepy.tech/project/pytest-httpserver)
 
 ## pytest_httpserver