Add Badges to README (#588)

Signed-off-by: Ian Hoang <[email protected]>
Co-authored-by: Ian Hoang <[email protected]>

README.md

@@ -1,3 +1,9 @@
+[![CI](https://github.com/opensearch-project/opensearch-benchmark/actions/workflows/main.yml/badge.svg)](https://github.com/opensearch-project/opensearch-benchmark/actions/workflows/main.yml)
+[![Integration](https://github.com/opensearch-project/opensearch-benchmark/actions/workflows/manual-integ.yml/badge.svg)](https://github.com/opensearch-project/opensearch-benchmark/actions/workflows/manual-integ.yml)
+[![Release](https://github.com/opensearch-project/opensearch-benchmark/actions/workflows/release-drafter.yml/badge.svg)](https://github.com/opensearch-project/opensearch-benchmark/actions/workflows/release-drafter.yml)
+![Chat](https://img.shields.io/badge/chat-on%20forums-blue)](https://forum.opensearch.org/categories)
+![PRs welcome!](https://img.shields.io/badge/PRs-welcome!-success)
+
 <img src="https://github.com/opensearch-project/opensearch-benchmark/blob/main/opensearch_benchmark.png?raw=true"  height="64px" alt="OpenSearch Benchmark">
 
 OpenSearch Benchmark is the macrobenchmarking framework for OpenSearch.