runtime(gleam): add ftplugin for gleam files

fixes: #15864
closes: #15866

Signed-off-by: Trilowy <49493635+trilowy@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

Author: trilowy

.github/MAINTAINERS

@@ -163,6 +163,7 @@ runtime/ftplugin/gitconfig.vim		@tpope
 runtime/ftplugin/gitignore.vim		@ObserverOfTime
 runtime/ftplugin/gitrebase.vim		@tpope
 runtime/ftplugin/gitsendemail.vim	@tpope
+runtime/ftplugin/gleam.vim		@trilowy
 runtime/ftplugin/go.vim			@dbarnett
 runtime/ftplugin/goaccess.vim		@meonkeys
 runtime/ftplugin/gomod.vim		@yu-yk

runtime/ftplugin/gleam.vim

@@ -0,0 +1,16 @@
+" Vim filetype plugin file
+" Language:    Gleam
+" Maintainer:  Trilowy (https://github.com/trilowy)
+" Last Change: 2024 Oct 13
+
+if exists('b:did_ftplugin')
+  finish
+endif
+let b:did_ftplugin = 1
+
+setlocal comments=://,:///,:////
+setlocal commentstring=//\ %s
+
+let b:undo_ftplugin = "setlocal comments< commentstring<"
+
+" vim: sw=2 sts=2 et