Update README.md

README.md

@@ -1,3 +1,8 @@
 # prep
 
-Historical market data prep tool for synth.
+[![audit](https://github.com/oerlikon/prep/actions/workflows/ci.yml/badge.svg)](https://github.com/oerlikon/prep/actions/workflows/ci.yml)
+[![python](https://img.shields.io/badge/Python-3.11-3776AB.svg?style=flat&logo=python&logoColor=white)](https://www.python.org)
+[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
+[![Checked with mypy](http://www.mypy-lang.org/static/mypy_badge.svg)](http://mypy-lang.org/)
+
+Historical market data prep tool for [github.com/oerlikon/synth](https://github.com/oerlikon/synth).