docs: add budges

Author: SepineTam

README.md

@@ -1,5 +1,8 @@
 # OpenAI-API-Polling
 
+[![PyPI version](https://img.shields.io/pypi/v/openai-api-polling.svg)](https://pypi.org/project/openai-api-polling/)
+[![PyPI Downloads](https://static.pepy.tech/badge/openai-api-polling)](https://pepy.tech/projects/openai-api-polling)
+
 Polling OpenAI API without rate limit issues.
 
 ## Quickly Start