Add worker package to README

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

Author: gearnode

README.md

@@ -20,6 +20,7 @@ Kit provides foundational packages for building production-grade Go services wit
 | `migrator` | Database schema migrations with advisory locking |
 | `httpserver` | HTTP server with request tracing and metrics |
 | `httpclient` | HTTP client with telemetry and connection management |
+| `worker` | Task workers with polling, concurrency limits, and periodic scheduling |
 
 ## Requirements