chore: add badges to README (#39)

README.md

@@ -1,3 +1,11 @@
+<p align=center>
+<a href="https://pypi.org/project/vectordb/"><img alt="PyPI" src="https://img.shields.io/pypi/v/vectordb?label=Release&style=flat-square"></a>
+<!--<a href="https://codecov.io/gh/jina-ai/vectordb"><img alt="Codecov branch" src="https://img.shields.io/codecov/c/github/jina-ai/vectordb/master?&logo=Codecov&logoColor=white&style=flat-square"></a>-->
+<a href="https://discord.jina.ai"><img src="https://img.shields.io/discord/1106542220112302130?logo=discord&logoColor=white&style=flat-square"></a>
+<a href="https://pypistats.org/packages/vectordb"><img alt="PyPI - Downloads from official pypistats" src="https://img.shields.io/pypi/dm/vectordb?style=flat-square"></a>
+<a href="https://github.com/jina-ai/vectordb/actions/workflows/cd.yml"><img alt="Github CD status" src="https://github.com/jina-ai/vectordb/actions/workflows/cd.yml/badge.svg"></a>
+</p>
+
 # Vector Database for Python Developers
 
 Vector databases store embeddings for semantic similarity between objects, enabling similarity searches across multimodal data types. They enhance LLM applications by providing context and improving generation results.