Add cookbook reference to bash-env plugin

Author: tesujimath

cookbook/foreign_shell_scripts.md

@@ -63,6 +63,13 @@ This quickly gets tricky though, for example when the script is declaring a
 There are ways to implement some form of expansion too, but at some point it
 might make more sense to leave the parsing to the shell it was meant for.
 
+## Bash Env Plugin
+
+There is a third-party Nu plugin [bash-env](https://github.com/tesujimath/nu_plugin_bash_env)
+for importing environment variables from Bash format files and pipes.
+This plugin uses Bash itself to parse the environment definitions,
+and can therefore cope with arbitrarily complex Bash sources.
+
 ## Capturing the environment from a foreign shell script
 
 A more complex approach is to run the script in the shell it is written for and