Add a README-zh.md as the Chinese version of README.md (#1970)

Add README-zh.md to replace the outdated one. Also fix url ref.

README.md

@@ -13,7 +13,7 @@
   <a href="#customization">Customization</a> •
   <a href="#project-goals-and-alternatives">Project goals, alternatives</a><br>
   [English]
-  [<a href="https://github.com/chinanf-boy/bat-zh">中文</a>]
+  [<a href="doc/README-zh.md">中文</a>]
   [<a href="doc/README-ja.md">日本語</a>]
   [<a href="doc/README-ko.md">한국어</a>]
   [<a href="doc/README-ru.md">Русский</a>]