docs: add more badges to the readme (#10)

Author: masci

README.md

@@ -1,7 +1,11 @@
 # LlamaIndex Workflows
 
+[![Unit Testing](https://github.com/run-llama/workflows/actions/workflows/test.yml/badge.svg)](https://github.com/run-llama/workflows/actions/workflows/test.yml)
+[![Coverage Status](https://coveralls.io/repos/github/run-llama/workflows/badge.svg?branch=main)](https://coveralls.io/github/run-llama/workflows?branch=main)
+[![GitHub contributors](https://img.shields.io/github/contributors/run-llama/workflows)](https://github.com/run-llama/llama-index-workflows/graphs/contributors)
+
+
 [![PyPI - Downloads](https://img.shields.io/pypi/dm/llama-index-workflows)](https://pypi.org/project/llama-index-workflows/)
-[![GitHub contributors](https://img.shields.io/github/contributors/run-llama/workflows)](https://github.com/run-llama/workflows/graphs/contributors)
 [![Discord](https://img.shields.io/discord/1059199217496772688)](https://discord.gg/dGcwcsnxhU)
 [![Twitter](https://img.shields.io/twitter/follow/llama_index)](https://x.com/llama_index)
 [![Reddit](https://img.shields.io/reddit/subreddit-subscribers/LlamaIndex?style=plastic&logo=reddit&label=r%2FLlamaIndex&labelColor=white)](https://www.reddit.com/r/LlamaIndex/)