chore: add badges

Author: sciyoshi

README.md

@@ -1,5 +1,14 @@
 # mudder-py
 
+[![GitHub Workflow Status (main)](https://img.shields.io/github/actions/workflow/status/fellowapp/mudder-py/ci.yml?branch=main&style=flat)][main CI]
+[![PyPI](https://img.shields.io/pypi/v/mudder?style=flat)][package]
+[![PyPI - Python Version](https://img.shields.io/pypi/pyversions/mudder-py?style=flat)][package]
+[![License](https://img.shields.io/pypi/l/prosemirror.svg?style=flat)](https://github.com/fellowapp/mudder-py/blob/master/LICENSE.md)
+[![Fellow Careers](https://img.shields.io/badge/fellow.app-hiring-576cf7.svg?style=flat)](https://fellow.app/careers/)
+
+[main CI]: https://github.com/fellowapp/mudder-py/actions?query=workflow%3ACI+branch%3Amain
+[package]: https://pypi.org/project/mudder/
+
 This library is a port of [fasiha/mudderjs][1] to Python.
 
 From the original readme: