Add "don't use this project" error at the top (#20)

README.md

@@ -1,13 +1,15 @@
 # Roku-Promise
 
-A Promise-like implementation for BrightScript/Roku
 
 [![build status](https://img.shields.io/github/workflow/status/rokucommunity/roku-promise/build.svg?logo=github)](https://github.com/rokucommunity/roku-promise/actions?query=workflow%3Abuild)
 [![monthly downloads](https://img.shields.io/npm/dm/roku-promise.svg?sanitize=true&logo=npm&logoColor=)](https://npmcharts.com/compare/roku-promise?minimal=true)
 [![npm version](https://img.shields.io/npm/v/roku-promise.svg?logo=npm)](https://www.npmjs.com/package/roku-promise)
 [![license](https://img.shields.io/github/license/rokucommunity/roku-promise.svg)](LICENSE)
 [![Slack](https://img.shields.io/badge/Slack-RokuCommunity-4A154B?logo=slack)](https://join.slack.com/t/rokudevelopers/shared_invite/zt-4vw7rg6v-NH46oY7hTktpRIBM_zGvwA)
 
+> [!CAUTION]
+> This is a legacy project which is not under active development. Use [@rokucommunity/promises](https://github.com/rokucommunity/promises) instead which provides a much more rhobust promise solution.
+
 This library helps making asynchronous logic simpler, by keeping invocation and result handling code
 all together in one place instead of littering your code with observer handlers that make code
 hard to follow.