runtime(rescript): include basic rescript ftplugin file (#14822)

Reference: https://rescript-lang.org/docs/manual/latest/overview#comments

Signed-off-by: Riley Bruins <ribru17@hotmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/ftplugin/rescript.vim b/runtime/ftplugin/rescript.vim
new file mode 100644
index 0000000..dd94c68
--- /dev/null
+++ b/runtime/ftplugin/rescript.vim
@@ -0,0 +1,13 @@
+" Vim filetype plugin
+" Language:	rescript
+" Maintainer:	Riley Bruins <ribru17@gmail.com>
+" Last Change:	2024 May 21
+
+if exists('b:did_ftplugin')
+  finish
+endif
+let b:did_ftplugin = 1
+
+setl comments=sO:*\ -,mO:*\ \ ,exO:*/,s1:/*,mb:*,ex:*/,:// commentstring=//\ %s
+
+let b:undo_ftplugin = 'setl com< cms<'