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

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Co-authored-by: wangjinghan.1991 <[email protected]>
Co-authored-by: Tyler Williams <[email protected]>