docs(README.md): add nice badges to README (#128)

* docs(README.md): add nice badges to doc

* docs(README.md): add python version badge

* Update README.md

Co-authored-by: Yusuke Oda <yusuke.oda@predicate.jp>

Co-authored-by: Yusuke Oda <yusuke.oda@predicate.jp>

Author: jianan1104

README.md

@@ -1,4 +1,11 @@
-# `latexify`
+# latexify
+[![Python](https://img.shields.io/pypi/pyversions/latexify-py.svg)](https://pypi.org/project/latexify-py/)
+[![PyPI Latest Release](https://img.shields.io/pypi/v/latexify-py.svg)](https://pypi.org/project/latexify-py/)
+[![License](https://img.shields.io/pypi/l/latexify-py.svg)](https://github.com/google/latexify_py/blob/main/LICENSE)
+[![Downloads](https://pepy.tech/badge/latexify-py/month)](https://pepy.tech/project/latexify-py)
+[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
+[![Imports: isort](https://img.shields.io/badge/%20imports-isort-%231674b1?style=flat&labelColor=ef8336)](https://pycqa.github.io/isort/)
+
 
 `latexify` is a Python package to compile a fragment of Python source code to a
 corresponding $\LaTeX$ expression: