runtime(nim): basic nim ftplugin file for comments (#14812)

Reference: https://nim-by-example.github.io/comments/#:~:text=Comments%20in%20Nim%20begin%20with%20the%20hash%20character.&text=Multiline%20or%20block%20comments%20begin,line%20comments%20can%20be%20nested.

Signed-off-by: Riley Bruins <ribru17@hotmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/ftplugin/nim.vim b/runtime/ftplugin/nim.vim
new file mode 100644
index 0000000..4ab8b7b
--- /dev/null
+++ b/runtime/ftplugin/nim.vim
@@ -0,0 +1,13 @@
+" Vim filetype plugin
+" Language:	nim
+" Maintainer:	Riley Bruins <ribru17@gmail.com>
+" Last Change:	2024 May 19
+
+if exists('b:did_ftplugin')
+  finish
+endif
+let b:did_ftplugin = 1
+
+setl comments=exO:]#,fs1:#[,mb:*,ex:]#,:# commentstring=#\ %s
+
+let b:undo_ftplugin = 'setl com< cms<'