nu: add page (#5818)

* nu: add page

* Apply suggestions from code review

pages/common/nu.md

@@ -0,0 +1,24 @@
+# nu
+
+> Nushell ("a new type of shell") takes a modern, structured approach to your command-line.
+> More information: <https://www.nushell.sh>.
+
+- Start an interactive shell session:
+
+`nu`
+
+- Execute a command and then exit:
+
+`nu --commands "{{command}}"`
+
+- Execute a script:
+
+`nu {{path/to/script.nu}}`
+
+- Execute a script with logging:
+
+`nu --loglevel {{error|warn|info|debug|trace}} {{path/to/script.nu}}`
+
+- Print the Nushell version:
+
+`nu --version`