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/.github/MAINTAINERS b/.github/MAINTAINERS
index a97d18d..e5c88f4 100644
--- a/.github/MAINTAINERS
+++ b/.github/MAINTAINERS
@@ -184,6 +184,7 @@
 runtime/ftplugin/modula2.vim		@dkearns
 runtime/ftplugin/modula3.vim		@dkearns
 runtime/ftplugin/nginx.vim		@chr4
+runtime/ftplugin/nim.vim		@ribru17
 runtime/ftplugin/nroff.vim		@a-vrma
 runtime/ftplugin/nsis.vim		@k-takata
 runtime/ftplugin/octave.vim		@dkearns
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<'