runtime(nu): include filetype plugin

This is used to set the commentstring option.

closes: #15601

Signed-off-by: Christian Brabandt <cb@256bit.org>
Signed-off-by: Marc Jakobi <marc.jakobi@tiko.energy>
diff --git a/runtime/ftplugin/nu.vim b/runtime/ftplugin/nu.vim
new file mode 100644
index 0000000..9efbc3b
--- /dev/null
+++ b/runtime/ftplugin/nu.vim
@@ -0,0 +1,13 @@
+" Vim filetype plugin
+" Language:	Nu
+" Maintainer:	Marc Jakobi <marc@jakobi.dev>
+" Last Change:	2024 Aug 31
+
+if exists('b:did_ftplugin')
+  finish
+endif
+let b:did_ftplugin = 1
+
+setlocal commentstring=#\ %s
+
+let b:undo_ftplugin = 'setl com<'