runtime(dart): add basic dart ftplugin file

fixes #14793
closes #14802

Signed-off-by: Riley Bruins <ribru17@hotmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

.github/MAINTAINERS

@@ -117,6 +117,7 @@ runtime/ftplugin/cs.vim			@nickspoons
 runtime/ftplugin/csh.vim		@dkearns
 runtime/ftplugin/css.vim		@dkearns
 runtime/ftplugin/cucumber.vim		@tpope
+runtime/ftplugin/dart.vim	@ribru17
 runtime/ftplugin/deb822sources.vim	@jamessan
 runtime/ftplugin/debchangelog.vim	@jamessan
 runtime/ftplugin/debcontrol.vim		@jamessan

runtime/ftplugin/dart.vim

@@ -0,0 +1,15 @@
+" Vim filetype plugin
+" Language:	dart
+" Maintainer:	Riley Bruins <ribru17@gmail.com>
+" Last Change:	2024 May 18
+
+if exists('b:did_ftplugin')
+  finish
+endif
+let b:did_ftplugin = 1
+
+" Set 'comments' to format dashed lists in comments.
+" Also include ///, used for Doxygen.
+setl comments=sO:*\ -,mO:*\ \ ,exO:*/,s1:/*,mb:*,ex:*/,:///,:// commentstring=//\ %s
+
+let b:undo_ftplugin = 'setl com< cms<'