Update runtime files

runtime/ftplugin/jsonc.vim

@@ -0,0 +1,27 @@
+" Vim filetype plugin
+" Language:         JSONC (JSON with Comments)
+" Original Author:  Izhak Jakov <izhak724@gmail.com>
+" Acknowledgement:  Based off of vim-jsonc maintained by Kevin Locke <kevin@kevinlocke.name>
+"                   https://github.com/kevinoid/vim-jsonc
+" License:          MIT
+" Last Change:      2021-07-01
+
+runtime! ftplugin/json.vim
+
+if exists('b:did_ftplugin_jsonc')
+  finish
+else
+  let b:did_ftplugin_jsonc = 1
+endif
+
+" A list of commands that undo buffer local changes made below.
+let s:undo_ftplugin = []
+
+" Set comment (formatting) related options. {{{1
+setlocal commentstring=//%s comments=sO:*\ -,mO:*\ \ ,exO:*/,s1:/*,mb:*,ex:*/,://
+call add(s:undo_ftplugin, 'commentstring< comments<')
+
+" Let Vim know how to disable the plug-in.
+call map(s:undo_ftplugin, "'execute ' . string(v:val)")
+let b:undo_ftplugin = join(s:undo_ftplugin, ' | ')
+unlet s:undo_ftplugin