feat: add support for nu shell (#2847)

docs/README.md

@@ -129,3 +129,20 @@ description: Starship is the minimal, blazing fast, and extremely customizable p
 
    eval `starship init tcsh`
    ```
+
+    #### Nushell
+
+   ::: warning
+   This will change in the future.
+   Only nu version v0.33 or higher is supported.
+   :::
+   Add the following to your nu config file:
+
+   ```toml
+   startup = [
+    "mkdir ~/.cache/starship",
+    "starship init nu | save ~/.cache/starship/init.nu",
+    "source ~/.cache/starship/init.nu"
+   ]
+   prompt = "starship_prompt"
+   ```

docs/config/README.md

@@ -413,7 +413,7 @@ look at [this example](#with-custom-error-shape).
 
 ::: warning
 
-`error_symbol` is not supported on elvish shell.
+`error_symbol` is not supported on elvish and nu shell.
 
 :::
 
@@ -1487,7 +1487,7 @@ then the module will also show when there are 0 jobs running.
 
 ::: warning
 
-This module is not supported on tcsh.
+This module is not supported on tcsh and nu.
 
 :::
 
@@ -2624,7 +2624,7 @@ To enable it, set `disabled` to `false` in your configuration file.
 :::
 
 ::: warning
-This module is not supported on elvish shell.
+This module is not supported on elvish and nu shell.
 :::
 
 ### Options