runtime(vim): include Vim Syntax generator

fixes: #13939
closes: #14021
related: vim-jp/syntax-vim-ex#28

Signed-off-by: h-east <h.east.727@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/syntax/generator/README.md

@@ -0,0 +1,26 @@
+# Generator of Vim Script Syntax File
+
+This directory contains a Vim Script generator, that will parse the Vim source file and
+generate a vim.vim syntax file.
+
+Files in this directory where copied from https://github.com/vim-jp/syntax-vim-ex/
+and included here on Feb, 13th, 2024 for the Vim Project.
+
+- Maintainer: Hirohito Higashi
+- License: Vim License
+
+## How to generate
+
+    $ make
+
+This will generate `../vim.vim`
+
+## Files
+
+Name                 |Description
+---------------------|------------------------------------------------------
+`Makefile`           |Makefile to generate ../vim.vim
+`README.md`          |This file
+`gen_syntax_vim.vim` |Script to generate vim.vim
+`update_date.vim`    |Script to update "Last Change:"
+`vim.vim.base`       |Template for vim.vim