add a reference to pspg a postgres pager which integrates in nushell.

README.md

@@ -105,6 +105,7 @@ Other tools that work with or within the nu language ecosystem.
 - [nuPHP](https://github.com/mikayla-maki/nuPHP): Nu personal homepage webserver.
 - [broot](https://github.com/Canop/broot): A new way to see and navigate directory trees.
 - [nur](https://github.com/ddanier/nur): A taskrunner based on nu shell.
+- [pspg](https://github.com/okbob/pspg): A postgres pager that integrates in nushell.
 
 ## Editor Extensions
 Plugins and Extensions that you can use in other text editors