maint: Add link to sunset issue in README (#734)

## Which problem is this PR solving?

Add link to sunset issue in README.

OSSMETADATA

@@ -1 +1 @@
-osslifecycle=maintained
+osslifecycle=beingsunset

README.md

@@ -1,9 +1,11 @@
 # Honeycomb Beeline for NodeJS
 
-[![OSS Lifecycle](https://img.shields.io/osslifecycle/honeycombio/beeline-nodejs?color=success)](https://github.com/honeycombio/home/blob/main/honeycomb-oss-lifecycle-and-practices.md)
+[![OSS Lifecycle](https://img.shields.io/osslifecycle/honeycombio/beeline-nodejs?color=pink)](https://github.com/honeycombio/home/blob/main/honeycomb-oss-lifecycle-and-practices.md)
 [![CircleCI](https://circleci.com/gh/honeycombio/beeline-nodejs.svg?style=shield)](https://circleci.com/gh/honeycombio/beeline-nodejs)
 [![npm](https://img.shields.io/npm/v/honeycomb-beeline)](https://www.npmjs.com/package/honeycomb-beeline)
 
+⚠️**STATUS**: This project is being Sunset. See [this issue](https://github.com/honeycombio/beeline-nodejs/issues/733) for more details.
+
 ⚠️**Note**: Beelines are Honeycomb's legacy instrumentation libraries. We embrace OpenTelemetry as the effective way to instrument applications. For any new observability efforts, we recommend [instrumenting with OpenTelemetry](https://docs.honeycomb.io/send-data/javascript-nodejs/opentelemetry-sdk/).
 
 This package makes it easy to instrument your Express/NodeJS application to send useful events to [Honeycomb](https://honeycomb.io), a service for debugging your software in production.