Add instructions for nushell on MacOS, Linux and Windows

README.md

@@ -358,6 +358,24 @@ See [Advanced configuration](#advanced-configuration) for details and more confi
     ~~~ fish
     pyenv init - | source
     ~~~
+    
+  - For **Nushell**:
+
+    On MacOS or Linux, the path can be added like:
+    
+    ~~~ nu
+    $env.PATH = ($env.PATH | split row (char esep) | prepend $"(pyenv root)/shims")
+    ~~~
+
+    Windows users need to install [pyenv-win](https://github.com/pyenv-win/pyenv-win)
+    and execute the `Get-Command pyenv` command in PowerShell to get the path of `pyenv.ps1` after the installation.
+
+    The result usually looks like: `C:\Users\<your-username>\.pyenv\pyenv-win\bin\pyenv.ps1`
+
+    Then add the path of pyenv to your Nushell PATH:
+    ~~~ nu
+    $env.Path = ($env.Path | split row (char esep) | prepend $"~/.pyenv/pyenv-win/bin/pyenv.ps1")
+    ~~~
 
    **Bash warning**: There are some systems where the `BASH_ENV` variable is configured
    to point to `.bashrc`. On such systems, you should almost certainly put the