runtime(javacc): include javacc ftplugin file

closes: #15167

Signed-off-by: Riley Bruins <ribru17@hotmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/ftplugin/javacc.vim b/runtime/ftplugin/javacc.vim
new file mode 100644
index 0000000..780c68b
--- /dev/null
+++ b/runtime/ftplugin/javacc.vim
@@ -0,0 +1,20 @@
+" Vim filetype plugin
+" Language:	JavaCC
+" Maintainer:	Riley Bruins <ribru17@gmail.com>
+" Last Change:	2024 Jul 06
+
+if exists('b:did_ftplugin')
+  finish
+endif
+let b:did_ftplugin = 1
+
+" Set 'formatoptions' to break comment lines but not other lines,
+" and insert the comment leader when hitting <CR> or using "o".
+setlocal formatoptions-=t formatoptions+=croql
+
+" Set 'comments' to format dashed lists in comments. Behaves just like C.
+setlocal comments& comments^=sO:*\ -,mO:*\ \ ,exO:*/
+
+setlocal commentstring=//\ %s
+
+let b:undo_ftplugin = 'setl fo< com< cms<'