mst-form-type documentation in markdown as we talked in email (#2168)

* Doc: add a breif README.md for mst-form-type

* Doc: update the documentation with an example and apis

* docs: move mst form type recipe to recipes folder

* docs: fix formatting in mst form type intro

* docs: update syntax highlighting with tsx designation

* docs: fix tsx syntax highlighting

* docs: remove notes about frequency of use in library

---------

Co-authored-by: wangjinghan.1991 <wangjinghan.1991@bytedance.com>
Co-authored-by: Tyler Williams <tyler@coolsoftware.dev>

Author: 3 people