README.md: add 3 badges

Author: ilius

README.md

@@ -1,5 +1,9 @@
 # PyGlossary
 
+[![PyPI](https://img.shields.io/pypi/v/pyglossary.svg)](https://pypi.org/project/pyglossary/)
+[![Supported Python versions](https://img.shields.io/pypi/pyversions/pyglossary)](https://pypi.org/project/pyglossary/)
+[![Tests](https://github.com/ilius/pyglossary/actions/workflows/test.yml/badge.svg?branch=master)](https://github.com/ilius/pyglossary/actions/workflows/test.yml?query=branch%3Amaster)
+
 <p align="center">
 	<img src="res/pyglossary-256x256.png"></img>
 </p>