chore: add badges to README (GoogleCloudPlatform#270)

Author: jackwotherspoon

README.md

@@ -1,4 +1,8 @@
 # Cloud SQL Connector for Python Drivers
+![CI](https://storage.googleapis.com/cloud-devrel-public/cloud-sql-connectors/python/python3.10_linux.svg)
+[![pypi](https://img.shields.io/pypi/v/cloud-sql-python-connector)](https://pypi.org/project/cloud-sql-python-connector)
+[![python](https://img.shields.io/pypi/pyversions/cloud-sql-python-connector)](https://pypi.org/project/cloud-sql-python-connector)
+
 **Warning**: This project is currently in _beta_. Please [open an issue](https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/new/choose) if you would like to report a bug or documentation issue, request a feature, or have a question.
 
 The Cloud SQL Python Connector is a library that can be used alongside a database driver to allow users with sufficient permissions to connect to a Cloud SQL