chore(readme): add badges

Author: igrr

CONTRIBUTING.md

@@ -26,6 +26,8 @@ A build script for the older Astyle 3.1 is also provided in `build-scripts/3.1`.
 
 ## Tagging a new release
 
-When tagging a new release, remember to update the package version in [astyle_py/__init__.py](astyle_py/__init__.py).
+When tagging a new release, remember to update the package version in:
+- [`astyle_py/__init__.py`](astyle_py/__init__.py)
+- [`README.md`](README.md)
 
 The release will be uploaded to PyPI automatically once the tag is pushed.

README.md

@@ -1,5 +1,8 @@
 # astyle_py — Python wrapper around [astyle](http://astyle.sourceforge.net/)
 
+![PyPI - Version](https://img.shields.io/pypi/v/astyle-py?labelColor=383838)
+ [![CI](https://github.com/igrr/astyle_py/actions/workflows/main.yml/badge.svg)](https://github.com/igrr/astyle_py/actions/workflows/main.yml) ![Python](https://img.shields.io/badge/dynamic/yaml?url=https://raw.githubusercontent.com/igrr/astyle_py/main/.github/workflows/main.yml&query=$.jobs['test'].strategy.matrix['python-version']&label=Python&logo=python&color=3366ff&logoColor=ffcc00&labelColor=383838)
+
 [Artistic Style (astyle)](http://astyle.sourceforge.net/) is a source code indenter, formatter, and beautifier for the C, C++, C++/CLI, Objective‑C, C# and Java programming languages.
 
 This project wraps `astyle` in a Python package. The package can be used: