chore: update root readme

Author: art049

README.md

@@ -3,4 +3,12 @@
 
 Node.js libraries to create CodSpeed benchmarks
 
+[![CI](https://github.com/CodSpeedHQ/codspeed-node/actions/workflows/ci.yml/badge.svg)](https://github.com/CodSpeedHQ/codspeed-node/actions/workflows/ci.yml)
+
 </div>
+
+This mono-repo contains the integration packages for using CodSpeed with Node.js:
+
+- [`@codspeed/tinybench-plugin`](./packages/tinybench-plugin/README.md): tinybench compatibility layer for CodSpeed
+- [`@codspeed/benchmark.js-plugin`](./packages/benchmark.js-plugin/README.md): Benchmark.js compatibility layer for CodSpeed
+- [`@codspeed/core`](./packages/core/README.md): The core library used to integrate with Codspeed runners