runtime(robot): Include ftplugin and set comment options

Set 'comments' and 'commentstring' for Robot Framework files.

closes: #21220

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Signed-off-by: Dawid Dziurla <dawidd0811@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

.github/MAINTAINERS

@@ -316,6 +316,7 @@ runtime/ftplugin/rasi.vim				@fymyte
 runtime/ftplugin/readline.vim				@dkearns
 runtime/ftplugin/remind.vim				@joereynolds
 runtime/ftplugin/rescript.vim				@ribru17
+runtime/ftplugin/robot.vim				@dawidd6
 runtime/ftplugin/routeros.vim				@zainin
 runtime/ftplugin/rst.vim				@marshallward
 runtime/ftplugin/ruby.vim				@tpope @dkearns

runtime/ftplugin/robot.vim

@@ -0,0 +1,17 @@
+" Vim filetype plugin
+" Language:	Robot Framework
+" Maintainer:	Dawid Dziurla (github.com/dawidd6)
+" Last Change:	2026 Sep 04
+
+if exists('b:did_ftplugin')
+  finish
+endif
+let b:did_ftplugin = 1
+
+setl comments=:# commentstring=#\ %s
+
+let b:undo_ftplugin = get(b:, 'undo_ftplugin', '')
+if !empty(b:undo_ftplugin)
+  let b:undo_ftplugin .= ' | '
+endif
+let b:undo_ftplugin .= 'setlocal comments< commentstring<'