Add PubSubx (#4887)

README.md

@@ -1808,6 +1808,7 @@ There are [other sites with curated lists of elixir packages](#other-awesome-lis
 * [plasm](https://github.com/facto/plasm) - Plasm is Ecto's composable query multitool, containing higher-level functions such as .count, .random, .first, .last, .find, .inserted_before, .inserted_after, etc.
 * [plugmap](https://github.com/nerdslabs/plugmap) - Plugmap is sitemap generation library for Plug/Phoenix Framework.
 * [pubsub](https://github.com/simonewebdesign/elixir_pubsub) - A Publish-Subscribe utility library that implements a pub-sub mechanism to ease the burden of communication on the business logic processes.
+* [PubSubx](https://github.com/sonic182/pub_subx) - A simple publish-subscribe system built on Elixir's GenServer and Registry, allowing for dynamic topics, process monitoring, and automatic subscription management.
 * [quark](https://github.com/robot-overlord/quark) - A library for common functional programming idioms: combinators, currying, and partial application.
 * [retry](https://github.com/safwank/ElixirRetry) - Simple Elixir macros for linear retry, exponential backoff and wait with composable delays.
 * [sips_downloader](https://github.com/DavsX/SipsDownloader) - Elixir module for downloading the ElixirSips episodes and all other files.